Patrick Bushe

Free Chrome extension that applies intelligent dark mode to every website. Reduce eye strain with smart CSS filters, scheduling, and per-site control.

Free Chrome extension for hands-free browsing. Auto-scroll pages, rotate through tabs on a timer, and run URL playlists. Perfect for dashboards and kiosks.

Free Chrome extension that removes Google AI Overviews, sponsored results, and clutter from search pages. See only organic results instantly.

Free Chrome extension to pin sticky notes to any webpage. Access a global notepad from the side panel. Notes persist across sessions. No account needed.

Free Chrome extension that adds a reading progress bar to any webpage. Customizable color, position, and size. See how far through an article you are instantly.

Free Chrome extension that applies a warm amber overlay to reduce blue light. Protect your eyes at night. Adjustable intensity and scheduling.

Free Chrome extension for instant word count, character count, sentence count, and reading time on any webpage or selected text. No sign-up required.

Free Chrome extension to identify fonts on any webpage by hovering or clicking. See font name, size, weight, and color instantly. No account needed.

Free Chrome extension that calculates meeting costs in real-time. Enter attendee count and salaries, watch the cost tick up live. Make every meeting count.

Free Chrome extension that automatically rejects cookie consent banners. Supports OneTrust, Cookiebot, TrustArc, and more. Never click reject again.

Free Chrome extension for focused reading. Highlights one paragraph at a time to eliminate distractions. Great for ADHD, dyslexia, and deep focus sessions.

Free Chrome extension to extract color palettes from any website. Copy HEX, RGB, or HSL values instantly. Perfect for designers and developers.

Free Chrome extension that blocks websites from reading your clipboard without permission. Get notified and approve or deny clipboard access per site.

Free Chrome extension that auto-browses random sites in the background to poison your ad profile. Obfuscate your browsing data from advertisers.

Free Chrome extension that blocks WebRTC IP leaks. Protect your real IP address even when using a VPN. Simple toggle, zero configuration required.

Free Chrome extension for instant Wayback Machine access. Check if any page is archived, view the latest snapshot, and archive pages in one click.

Free Chrome extension that adds price per square foot badges directly on Zillow listing cards. Compare home values at a glance without clicking each listing.

Free Chrome extension that instantly detects which Shopify theme and apps any store is running. Perfect for e-commerce research and competitor analysis.

Free Chrome extension that extracts all tags and keywords from any Etsy listing. Copy or download tags as CSV. Perfect for Etsy sellers doing SEO research.

Detect AI-generated images instantly. Scans EXIF, IPTC, XMP & C2PA metadata locally — 100% private. Supports Midjourney, DALL-E, Stable Diffusion & 30+ tools.

Operations and billing platform for small construction businesses — run every job from first call to final payment.

Paste SVG code to preview it instantly, read its width, height, and viewBox, check the byte size, and download the file — all locally in your browser.

Turn any SVG into a compact, URL-encoded CSS background-image data URI you can paste straight into a stylesheet, with a live preview. Private in your browser.

Generate smooth, random organic blob shapes as clean SVG — tune complexity, edge irregularity, and fill colour, then copy or download. Private in your browser.

Generate smooth SVG wave dividers for section transitions — set amplitude, wave count, flip, and colour, then copy the full-width SVG. Private in your browser.

Convert A1C to estimated average glucose using the ADAG formula. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate approximate alcohol by volume from original gravity and final gravity readings. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate average ad frequency by dividing total impressions by unique reach. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate an eight-digit Adler-32 checksum from UTF-8 text with the standard prime modulus, plus a clear non-security warning in your browser.

Calculate affiliate commission and the merchant share from an order value and commission rate. It runs entirely in your browser, with no uploads or accounts.

Calculate a blended hourly rate from senior and junior rates and hours. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate total and annual contract value from a monthly amount and a term. Everything is calculated locally in your browser, with no uploads or sign-ups.

Convert APR to APY with a manual compounding frequency so savings and loan rates can be compared. It runs entirely in your browser, with no uploads or accounts.

Convert APY to nominal APR for a selected compounding frequency with transparent local math. It runs entirely in your browser, with no uploads or accounts.

Free Armstrong number checker that raises each decimal digit to the digit count, totals the powers, and verifies the number in your browser.

Estimate the shared and unique members of an audience from a size and an overlap percentage. It runs entirely in your browser, with no uploads or accounts.

Calculate audio latency from a buffer size in samples and the sample rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate ARPU by dividing total revenue by the number of users. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate tiles and boxes for a backsplash from area, coverage, box size, and waste. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate interest-only balloon loan payments, total paid before maturity, and final balance. It runs entirely in your browser, with no uploads or accounts.

Free bandwidth delay product calculator that multiplies link rate by round-trip time and reports exact bits, bytes, and MiB in your browser.

Calculate the duration of a bar from beats per bar and the tempo. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate the portfolio needed after part-time income reduces annual expenses. Everything is calculated locally in your browser, with no uploads or sign-ups.

Encode UTF-8 text with RFC 9285 Base45 or decode Base45 groups with range checks, entirely offline with copy-ready output in your browser safely now.

Encode UTF-8 text as compact basE91 or decode valid basE91 back to text with strict local validation and one-click copying in your browser safely now.

Free Basic auth header generator that UTF-8 encodes a username and password, joins them correctly, and returns Base64 without uploads in your browser.

Calculate the duration of one beat from the tempo in BPM. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate downstream pressure from two speeds and elevations using steady incompressible Bernoulli flow, with local output in your browser safely now.

Calculate the number of squares from grid rows and columns. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate the number of blind slats from window height and slat pitch. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate body surface area. Every value is computed locally in your browser, so nothing is uploaded, stored, or shared, and no account is needed.

Estimate breakage revenue and expected redemptions from a balance and a breakage rate. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate salt grams for a brine from water weight and target salinity percent with private math. It runs entirely in your browser, with no uploads or accounts.

Calculate a bundle price and savings from the separate item total and a discount. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate Archimedes buoyant force, object weight, and net vertical force from fluid density and displaced volume privately in your browser.

Calculate work capacity hours from workdays and productive hours per day. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate total cabinet door area from a door count and average area each. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate the pull center position on a drawer from width and a placement percentage. It runs entirely in your browser — no uploads, accounts, or tracking.

Free Cache-Control header builder that safely validates visibility, freshness, revalidation, immutable, no-store, and stale reuse in your browser.

Calculate cake servings by dividing the top area by the area per serving. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate calories burned from MET value, body weight, and minutes with the standard exercise formula. It runs locally in your browser with no uploads.

Calculate equivalent capacitance for a positive list of parallel capacitor values, with count and total computed locally in your browser safely now.

Calculate equivalent capacitance for any positive list of series capacitor values and inspect the reciprocal sum privately in your browser safely now.

Calculate carb calories and grams from daily calories and a carb percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate linear feet of carpet needed from room area and roll width. Everything is calculated locally in your browser, with no uploads or sign-ups.

Split savings across certificate terms and estimate weighted average yield. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free chi-square independence calculator for a contingency table, returning expected counts, statistic, and degrees of freedom in your browser.

Free Chinese remainder theorem solver for simultaneous congruences with pairwise coprime moduli, verified and calculated privately in your browser.

Free CIDR aggregate calculator that normalizes IPv4 blocks, removes contained entries, and recursively merges aligned siblings in your browser.

Free CIDR containment checker that tests whether an IPv4 address or complete child CIDR lies inside a parent range with full range math in your browser.

Free CIDR overlap checker that normalizes two IPv4 blocks, detects intersection, and reports the exact shared address range in your browser.

Free CIDR split calculator that normalizes an IPv4 parent and enumerates equal child networks for a longer prefix with exact network math in your browser.

Estimate concrete block count from wall length, height, block face area, and waste percent. It runs entirely in your browser, with no uploads or accounts.

Calculate meetings attended and missed from total meetings and an attendance rate. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate hanger capacity from rod length and spacing per hanger. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Scale cocktail ingredient ounces by servings and dilution percent. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate coffee and water grams from brew ratio and desired cups with private kitchen math. It runs entirely in your browser, with no uploads or accounts.

Calculate coffee extraction yield from beverage mass, TDS, and dose. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free Collatz sequence calculator that applies the odd and even rules, lists every term, and reports step count and peak privately in your browser.

Calculate future value with starting balance, recurring contributions, return, and years. It runs entirely in your browser — no uploads, accounts, or tracking.

Free difference of means confidence interval calculator using two means, standard deviations, sample sizes, and z level privately in your browser.

Free difference of proportions confidence interval calculator from two success counts and sample sizes with selected confidence in your browser.

Calculate contraction MRR and the remaining MRR from downgrades. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate a contractor day rate from a project budget and billable days. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free Cookie header parser that handles semicolon pairs, quoted values, empty values, and percent decoding into structured JSON in your browser.

Free correlation matrix calculator that treats each line as a variable and returns every Pearson pairwise coefficient privately in your browser.

Free CORS header builder that safely validates one static origin, methods, request headers, credentials, Vary, and preflight age in your browser.

Calculate days elapsed and remaining from a total and an elapsed percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate CRC-16 CCITT-FALSE for UTF-8 text using polynomial 1021 and initial FFFF, with a known-vector result generated in your browser safely now.

Calculate CRC-16 MODBUS for UTF-8 text with initial value FFFF and reflected polynomial A001, returning lowercase hex locally in your browser.

Estimate creator ad revenue from a view count and a CPM (revenue per thousand). Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate credit utilization from card balances and limits, plus the payoff needed to hit a target. It runs locally in your browser with no uploads.

Free cross product calculator for two three-dimensional vectors, returning the perpendicular vector and its magnitude directly in your browser.

Calculate crypto profit, ROI, and ending value from buy price, sell price, and quantity manually. It runs entirely in your browser, with no uploads or accounts.

Free CSV to JavaScript array converter that parses quoted commas, escaped quotes, multiline fields, headers, and row arrays in your browser.

Free CSV to XML converter that parses quoted records, validates element names, escapes XML text, and names root and row nodes in your browser.

Free cubic equation solver using the depressed-cubic method to find every real root from four coefficients, computed privately in your browser.

Free cURL to Fetch converter that safely tokenizes shell quotes and maps methods, headers, request bodies, URLs, and Basic auth in your browser.

Free cURL to Python Requests converter that safely tokenizes shell syntax and maps methods, headers, bodies, Basic auth, and URLs in your browser.

Calculate curtain fabric width from window width, fullness ratio, and panel count. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate retained and lost customers from a starting count and a loss rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate work done in kilojoules from average power and duration. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate free-field sound level change between two distances with inverse-square spreading and private instant math directly in your browser.

Estimate deck boards from deck width, board width, gap, length, and waste percent. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate the single-draw chance of a matching card from deck size and matches. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate delay time from the quarter-note length and a note subdivision. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate attended and no-show demos from the number booked and a show rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate the deposit due and remaining balance from a total and a deposit rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free derangement calculator that counts permutations with no fixed positions using an exact recurrence for n from zero through 18 in your browser.

Free divisors calculator that lists every positive factor of an integer and reports divisor count, sum, and proper divisors in your browser.

Calculate the classic 32-bit DJB2 hash for UTF-8 bytes using hash times 33 plus byte, with deterministic local output in your browser safely now.

Free DNS record explainer that tokenizes zone-file syntax and labels owner, TTL, class, type, priority, target, and type fields in your browser.

Free DNS zone record builder that validates owner, TTL, class, record type, address, priority, and quoted TXT values with clear syntax in your browser.

Free Dockerfile generator that assembles a base image, work directory, dependency install, build, port, and JSON CMD with explicit steps in your browser.

Calculate shares accumulated, average cost, and ending value from recurring buys and ending price. It runs locally in your browser with no uploads.

Calculate observed frequency for moving source and observer speeds with a signed classical Doppler model, evaluated privately in your browser.

Free dot product calculator that multiplies matching vector components, adds the products, and checks equal dimensions privately in your browser.

Calculate total drip-system flow from the emitter count and flow each. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate drywall sheet count from wall area, sheet size, and waste percentage with local math. It runs entirely in your browser, with no uploads or accounts.

Calculate an early-payment discount and the reduced amount due. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free EditorConfig generator that builds global charset and line rules plus per-pattern indentation sections with clear syntax locally in your browser.

Convert recipe eggs between large egg equivalents and grams for baking adjustments. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate both final velocities for a one-dimensional perfectly elastic collision from two masses and starting velocities in your browser safely now.

Estimate the number of replies from emails sent and a reply rate. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate founder ownership after issuing new shares or options from current and new share counts. It runs locally in your browser with no uploads.

Calculate ideal escape speed from a spherical body using its mass and center radius, with the gravitational result computed privately in your browser.

Calculate cost per mile and per 100 miles from charge cost and miles driven. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate expansion MRR and the grown MRR from upsells and upgrades. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate annual fund fee drag and long-term cost from balance, expense ratio, and years. It runs entirely in your browser — no uploads, accounts, or tracking.

Free extended Euclidean calculator that returns the gcd and Bézout coefficients for two integers, verifies the identity, and runs in your browser.

Free quadratic factoring calculator that finds real roots and writes a polynomial as linear factors from a, b, and c entirely in your browser.

Calculate grams of fat from fat calories. Every value is computed locally in your browser, so nothing is uploaded, stored, or shared, and no account is needed.

Estimate fence pickets from run length, picket width, gap, gates, and waste with browser-only math. It runs locally in your browser with no uploads.

Calculate fence rails and bundles from sections, rails per section, bundle size, and waste. It runs entirely in your browser, with no uploads or accounts.

Calculate fertilizer pounds needed from target nitrogen, product N percent, and lawn area. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate cards per minute and seconds per card from cards and minutes. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate Fletcher-16 from UTF-8 bytes with two modulo-255 rolling sums, and inspect the four-digit non-security checksum in your browser safely now.

Calculate Fletcher-32 over big-endian UTF-8 word pairs with zero padding for an odd final byte, entirely and transparently in your browser safely now.

Calculate a lowercase FNV-1a 32-bit hash from UTF-8 text using the standard offset basis and prime, with local output in your browser safely now.

Calculate a 16-digit FNV-1a 64-bit hash from UTF-8 text using exact BigInt modular arithmetic, with private results in your browser safely now.

Calculate first-year withdrawal and monthly income from a portfolio using a manual withdrawal rate. It runs locally in your browser with no uploads.

Compare annual fuel cost between two vehicle efficiencies from miles, fuel price, and MPG. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate epoxy kits from floor area, coats, kit coverage, and waste. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate new engine RPM from old RPM and a new and old gear ratio. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate generator wattage from running watts, largest starting surge, and reserve margin. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate quality points from grade points and credit hours. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free additive grade curve calculator that shifts every score by the same points until the highest reaches 100, calculated privately in your browser.

Calculate retained MRR, churned MRR, and the GRR percentage from churn. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free grouped data mean calculator using class midpoints and frequencies to return the weighted total, sample count, and mean in your browser.

Calculate days completed and missed from planned days and a completion rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate the midpoint day number and span from a start and end day number. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free happy number checker that repeats squared-digit sums, displays the path, and detects either one or a repeating cycle entirely in your browser.

Free HAR to cURL converter that parses request entries and emits method, URL, headers, and body data with safe shell quoting in your browser.

Calculate steady one-dimensional heat conduction rate through a flat layer from conductivity, area, thickness, and temperature gap in your browser.

Calculate a HELOC interest-only monthly payment from balance and variable APR entered manually. It runs entirely in your browser, with no uploads or accounts.

Convert an hourly rate into weekly, monthly, and annual pay from hours and weeks entered. It runs entirely in your browser — no uploads, accounts, or tracking.

Free htaccess redirect generator that parses source and destination pairs into Apache Redirect or RewriteRule lines with clear errors in your browser.

Free HTML to JSX converter that safely parses markup and securely rewrites attributes, inline styles, comments, void tags, and text in your browser.

Free HTML to Markdown converter that parses a node tree and handles headings, links, lists, emphasis, code, images, quotes, and rules in your browser.

Calculate fluid needed from hours running and an hourly fluid rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free hypergeometric distribution calculator for exactly k successes when sampling without replacement from a finite population in your browser.

Calculate constant-product AMM impermanent loss from a price change ratio with local DeFi math. It runs entirely in your browser, with no uploads or accounts.

Calculate impulse, final momentum, and velocity change from constant force, duration, initial momentum, and mass privately in your browser safely now.

Calculate normal force, kinetic friction, and acceleration for a mass on an inclined plane using angle and friction inputs in your browser safely now.

Calculate shared velocity and kinetic energy lost when two objects stick together in a one-dimensional collision privately in your browser safely now.

Calculate the average initiative bonus from a total and a character count. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate saves and confirm the save rate from impressions and a save percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate total insulation R value from layers, thickness, and R per inch using local browser math. It runs locally in your browser with no uploads.

Calculate an interest-only payment and compare it with amortizing repayment for the same balance. It runs entirely in your browser, with no uploads or accounts.

Calculate annual and monthly inventory carrying cost from value and a carrying rate. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate the tax and tax-inclusive total from a subtotal and a tax rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate the pre-tax subtotal and tax portion from a tax-inclusive total. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free IP range to CIDR converter that covers an inclusive IPv4 start and end with the smallest aligned exact block list using exact math in your browser.

Free IPv6 compressor that validates eight hextets, expands double-colon input, removes leading zeros, and compresses the longest zero run in your browser.

Free IPv6 subnet calculator that applies a prefix with 128-bit arithmetic and reports the compressed network, host bits, and capacity in your browser.

Calculate Java String hashCode from UTF-16 code units with signed decimal and unsigned hexadecimal views, reproduced locally in your browser.

Free JSON to C Sharp class generator that infers nested models, System.Text.Json attributes, lists, and value types with clear output in your browser.

Free JSON to GraphQL type generator that safely infers nested object types, scalar fields, lists, and nullability hints from data in your browser.

Free JSON to INI converter that safely writes root settings, named sections, dotted nested keys, arrays, and safely quoted values in your browser.

Free JSON to Java class generator that safely infers nested POJOs, Jackson property annotations, lists, and scalar field types in your browser.

Free JSON to Kotlin data class generator that infers nested serializable models, lists, scalar types, and key aliases with clear output in your browser.

Free JSON to Mongoose schema generator that infers required nested definitions, arrays, strings, numbers, and booleans with valid syntax in your browser.

Free JSON to PHP class generator that infers typed readonly constructor properties and nested value objects with strict types in your browser.

Free JSON to XML plist converter that safely serializes dictionaries, arrays, strings, numbers, and booleans with escaped values in your browser.

Free JSON to Java properties converter that safely flattens nested objects and arrays into escaped dotted keys and scalar values in your browser.

Free JSON to Protobuf message generator that infers nested messages, repeated fields, scalar types, and stable field numbers in your browser.

Free JSON to Python Pydantic generator that safely infers nested BaseModel classes, aliases, lists, and field types from data in your browser.

Free JSON to Python TypedDict generator that safely infers nested dictionary declarations, list members, and annotations locally in your browser.

Free JSON to SQL INSERT converter that handles object arrays, unioned columns, quoted identifiers, escaped text, booleans, and null in your browser.

Free JSON to Swift Codable generator that safely infers nested structs, arrays, scalar properties, and CodingKeys aliases locally in your browser.

Free JSON to Yup schema generator that infers required nested objects, arrays, scalar fields, integers, and nullable values in your browser.

Free JSON to Zod schema generator that safely infers executable object, array, scalar, integer, and null validators from a sample in your browser.

Calculate ideal orbital period from semi-major axis and central mass using Newtonian Kepler form, with seconds and days returned in your browser.

Free sample excess kurtosis calculator using the unbiased Fisher correction to compare tail weight with a normal model privately in your browser.

Calculate final concentration and dilution factor from stock and volumes. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate leads and non-converting visits from traffic and a conversion rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate landscape fabric rolls from bed area, roll coverage, and overlap. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate a late fee and the new balance due from an invoice and a fee rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate lead-time demand from average daily demand and lead time. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate a licensing fee and the licensee share from net receipts and a rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate clicks and confirm the click-through rate from impressions and a click percentage. It runs entirely in your browser, with no uploads or accounts.

Compare two fixed loans by payment, total interest, and lifetime cost using manual rates and terms. It runs locally in your browser with no uploads.

Calculate churned and retained logos from a starting count and a churn rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Convert an amount using a manually entered exchange rate with no live lookup or external request. It runs entirely in your browser, with no uploads or accounts.

Free margin of error calculator for survey proportions using sample size, expected proportion, and confidence level, entirely in your browser.

Free Markdown to JSX converter that parses headings, paragraphs, lists, quotes, links, emphasis, inline code, and fenced blocks in your browser.

Free matrix determinant calculator using pivoted elimination for square matrices, with singularity detection and sign tracking in your browser.

Free matrix inverse calculator using pivoted Gauss-Jordan elimination for nonsingular square matrices, with clean private output in your browser.

Free matrix multiplication calculator that parses two matrices, checks compatible dimensions, and computes every row-column product in your browser.

Free matrix transpose calculator that swaps rows and columns for any rectangular numeric matrix and shows the new dimensions in your browser.

Calculate meal-prep containers from total food weight and grams per container. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free median absolute deviation calculator that finds the median, absolute residuals, and robust MAD for pasted numeric data in your browser.

Calculate a milestone payment and the remaining balance from a project total. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate payoff months and interest from balance, APR, and fixed monthly payment. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate session length from an exercise count and minutes each. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate rotational inertia for seven standard ideal shapes from mass and radius or length, with formula-specific output in your browser safely now.

Calculate the burn multiple from net burn and net new ARR. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate total moving-box volume from a box count and volume each. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free MTU payload calculator that subtracts IPv4 or IPv6 plus TCP or UDP headers and manual option bytes for transparent packet planning in your browser.

Calculate mulch bags from area, depth, bag size, and waste. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free multinomial coefficient calculator for category counts, showing total factorial over each group factorial with exact output in your browser.

Calculate MurmurHash3 x86 32-bit output from UTF-8 text and a numeric seed, with exact tail and finalization steps run in your browser safely now.

Calculate ending MRR and net revenue retention from a starting MRR and net expansion. It runs entirely in your browser — no uploads, accounts, or tracking.

Free packet overhead calculator that totals payload, headers, trailers, packet count, protocol bytes, and payload efficiency in your browser.

Estimate newsletter sponsorship revenue from subscribers and a sponsor CPM. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free normal distribution calculator returning z score, density, lower cumulative probability, and upper tail for x, mean, and SD in your browser.

Calculate a note frequency from a base pitch and a semitone offset. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free numeric derivative calculator using a central difference for common functions at any x value and positive step size, directly in your browser.

Free odds ratio calculator from a two-by-two event table, returning group odds and their ratio with clear direction entirely in your browser.

Calculate the next oil-change odometer from the current reading and an interval. Everything is calculated locally in your browser, with no uploads or sign-ups.

Compare Epley, Brzycki, and Lombardi one-rep max estimates from lifted weight and reps. It runs entirely in your browser — no uploads, accounts, or tracking.

Free one-way ANOVA calculator comparing three or more numeric groups with between, within, degrees of freedom, and F output in your browser.

Estimate ovulation day and fertile window from cycle length and period start serial day. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate pace per mile and 5K split targets from race distance and goal time inputs. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate scaled batter weight from a new and old pan area. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free Pascal triangle generator that builds every row from zero through your selected index and shows binomial coefficients privately in your browser.

Calculate paver base bags from area, depth, bag volume, and waste. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate remaining and used payload from a rating and a used percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate the burden cost and fully loaded payroll from base pay and a burden rate. It runs entirely in your browser — no uploads, accounts, or tracking.

Free perfect number checker that lists proper divisors, adds them, and tests whether their sum equals the positive integer privately in your browser.

Calculate personal loan payment, finance charge, and total repayment from amount, APR, and months. It runs locally in your browser with no uploads.

Calculate vinegar and water volumes for a brine from a parts ratio. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free picture srcset generator that groups responsive image candidates by MIME type and media rule into escaped HTML with valid markup in your browser.

Calculate the weight of each dough ball from total dough and a ball count. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate plates per side for a barbell target weight from bar weight and available large plates. It runs entirely in your browser, with no uploads or accounts.

Free XML plist to JSON converter that parses typed dictionaries, arrays, strings, numbers, booleans, dates, and data with strict errors in your browser.

Free polygon area calculator using the shoelace formula on ordered coordinate pairs, with signed orientation and absolute area in your browser.

Calculate pond gallons from length, width, average depth, and shape factor. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate target dollars and buy or sell amounts from total portfolio value and allocation percent. It runs locally in your browser with no uploads.

Calculate shares or units from account size, risk percent, entry price, and stop price. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate projectile flight time, range, and peak height from launch speed, angle, and starting elevation with private results in your browser.

Free Java properties to JSON converter that parses continuations, separators, escapes, Unicode codes, and dotted nested paths in your browser.

Calculate protein per meal from a daily target and a meal count. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Convert internationalized domain labels to ASCII Punycode and decode xn-- labels to Unicode using the RFC 3492 algorithm in your browser safely now.

Calculate a curved score by adding curve points to a raw score. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Encode UTF-8 text as quoted-printable or decode hexadecimal escapes and soft line breaks with strict validation, all locally in your browser.

Calculate expected winners from a ticket count and a win rate. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Estimate rainwater harvest from roof area, rainfall inches, and collection efficiency. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate ramp run from rise and slope ratio, then compare against the common 1 to 12 guideline. It runs entirely in your browser, with no uploads or accounts.

Calculate how many die rolls cover a random table from entries and die faces. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate pages per day from total pages and days available. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free README badge generator that encodes a label, message, color, logo, style, and target into Markdown and HTML with encoded paths in your browser.

Estimate rebar line count and total length for a slab grid from dimensions and spacing. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate water weight from flour weight and a hydration percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate a referral bonus and the net after payout from new revenue and a bonus rate. It runs entirely in your browser — no uploads, accounts, or tracking.

Free relative risk calculator from two cohort event tables, returning both group risks, risk ratio, and risk difference privately in your browser.

Calculate Lorentz factor and dilated coordinate time from proper time and speed as a fraction of light, with private math in your browser safely now.

Calculate included hours from a monthly retainer and an hourly rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate revenue per employee from annual revenue and headcount. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free reverse DNS pointer generator that converts IPv4 and IPv6 addresses into in-addr.arpa and nibble-reversed ip6.arpa names in your browser.

Calculate Reynolds number from density, speed, characteristic length, and dynamic viscosity, with a pipe-flow guide in your browser safely now.

Calculate trade risk, reward, ratio, and break-even win rate from entry, stop, and target. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate gallons needed from trip distance and fuel economy. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Estimate roofing squares and bundle count from roof area and waste percent. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate a royalty payment and the net to the seller from gross sales and a rate. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate an even gold split and the leftover from a total and a player count. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate SAFE conversion shares from investment, valuation cap, discount, and priced round valuation. It runs locally in your browser with no uploads.

Calculate safety stock units from daily demand and a buffer in days. Everything is calculated locally in your browser, with no uploads or sign-ups.

Convert annual salary to hourly, weekly, and monthly equivalents from hours per week and weeks worked. It runs locally in your browser with no uploads.

Calculate salt weight from flour weight and a salt baker’s percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate the total samples from a duration and a sample rate. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate sand volume and weight from area, depth, and density using manual project inputs. It runs entirely in your browser, with no uploads or accounts.

Convert between satoshis and BTC exactly with manual units and no price lookup or network request. It runs locally in your browser with no uploads.

Calculate the 32-bit SDBM hash recurrence from UTF-8 bytes with unsigned overflow and copy-ready non-security output in your browser safely now.

Free security.txt generator that validates contact methods and writes expiration, languages, canonical, encryption, and credits in your browser.

Estimate US self-employment tax from net earnings using the 92.35 percent base and 15.3 percent rate. It runs locally in your browser with no uploads.

Calculate total semester credits from a course count and credits each. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free Set-Cookie header builder that validates names, paths, lifetime, SameSite, Secure, HttpOnly, and value encoding with clear errors in your browser.

Calculate shelf boards from wall width, shelf count, board length, and waste. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free simplify radical calculator that extracts the largest perfect-square factor from a nonnegative integer square root, directly in your browser.

Free sample skewness calculator using the adjusted Fisher-Pearson coefficient to quantify asymmetry in pasted data, entirely in your browser.

Free socket address parser that distinguishes hostname, IPv4, bracketed IPv6, raw IPv6, and validated optional ports with strict errors in your browser.

Estimate panel count from monthly kWh target, sun hours, system efficiency, and panel wattage. It runs entirely in your browser, with no uploads or accounts.

Calculate equal split time from total time and number of segments with simple private math. It runs entirely in your browser, with no uploads or accounts.

Calculate harmonic frequency and wavelength for a string or open-open pipe from length, wave speed, and harmonic number locally in your browser.

Calculate flour, water, and total weight for a sourdough feeding. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free Stirling number of the second kind calculator counting partitions of n labeled objects into k nonempty unlabeled groups in your browser.

Calculate new average share cost after buying more shares at another price. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate usable and empty volume from unit size and a fill percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate student loan payment, total interest, and payoff cost from balance, APR, and term with private local math. It runs in your browser with no uploads.

Calculate how extra monthly student loan payments change payoff time and interest using local math. It runs locally in your browser with no uploads.

Calculate minutes per block from total study time and a block count. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate cost per ticket from support payroll and tickets resolved. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate sweat rate from fluid lost and hours exercised. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Free synthetic division calculator that divides polynomial coefficients by x minus k and reports the quotient and remainder instantly in your browser.

Calculate water and total syrup from sugar weight and a sugar-to-water ratio. Everything is calculated locally in your browser, with no uploads or sign-ups.

Free 3x3 system of equations solver using Cramer determinants to find x, y, and z from an augmented matrix, calculated privately in your browser.

Free Welch two-sample t-test calculator for two numeric samples, returning means, t statistic, degrees of freedom, and p range in your browser.

Free TCP transfer time estimator that combines decimal payload size, sustained throughput, RTT, and handshake round trips with assumptions in your browser.

Calculate final volume and water to add from concentrate and a dilution factor. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate ideal terminal velocity from mass, fluid density, projected area, drag coefficient, and gravity using local math in your browser safely now.

Calculate how many time slots fit from available minutes and slot length. Everything is calculated locally in your browser, with no uploads or sign-ups.

Compare tire diameter, circumference, and speedometer error from two tire sizes manually. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate workout tonnage from weight, reps, and sets. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Calculate topsoil cubic yards from area, depth, and waste percentage with private local math. It runs entirely in your browser, with no uploads or accounts.

Calculate tongue weight and axle load from trailer weight and a tongue percentage. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate session-RPE training load from minutes and session RPE. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Estimate total engagements from a follower count and an engagement rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate contribution per customer, contribution margin, and CAC payback from ARPU, costs, and CAC. It runs locally in your browser with no uploads.

Free URL component parser that safely separates protocol, credentials, hostname, port, path, duplicate query pairs, and fragment in your browser.

Free URL origin comparator that normalizes HTTP and HTTPS scheme, hostname, and effective port before testing same-origin status in your browser.

Calculate annual revenue from an hourly rate, weekly billable hours, and weeks worked. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate implied business valuation from revenue or EBITDA and a selected multiple. It runs entirely in your browser — no uploads, accounts, or tracking.

Free vector angle calculator using the dot product and vector magnitudes to return the included angle in degrees, calculated privately in your browser.

Calculate lease miles used and remaining from an allowance and a used percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate two-conductor voltage drop from one-way length, current, resistance per kilometer, and supply voltage privately in your browser safely now.

Calculate wire voltage drop, load voltage, and percent drop from current, resistance, and length. It runs entirely in your browser, with no uploads or accounts.

Calculate calories burned from minutes walking and calories per minute. Everything is calculated locally in your browser, with no uploads or sign-ups.

Estimate attendees and no-shows from registrants and an attendance rate. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate weekly rep volume from sets and reps per set. Everything is computed locally in your browser, with no uploads, no tracking, and no sign-ups.

Convert wei, gwei, and ETH units exactly with manual values and no live crypto pricing. It runs entirely in your browser — no uploads, accounts, or tracking.

Calculate the offset change and poke from a new and old wheel offset. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate a wholesale price and the discount off retail from a retail price. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate total window film area from a window count and area each. Everything is calculated locally in your browser, with no uploads or sign-ups.

Calculate standard servings from bottle volume and pour size with quick private arithmetic. It runs entirely in your browser, with no uploads or accounts.

Free XML to CSV converter that parses balanced markup, finds repeated row elements, unions child columns, and quotes CSV values in your browser.

Calculate days elapsed and remaining in a quarter from its length and an elapsed percentage. It runs entirely in your browser, with no uploads or accounts.

Convert instant yeast to active dry and fresh yeast equivalents with local cooking math. It runs entirely in your browser — no uploads, accounts, or tracking.

Estimate total watch time in minutes and hours from views and average view duration. It runs entirely in your browser — no uploads, accounts, or tracking.

Free one-sample mean z-test calculator using sample mean, hypothesized mean, known population deviation, and n with p value in your browser.

Encode hexadecimal byte groups with ZeroMQ Z85 or decode Z85 into exact lowercase hex, using strict block validation locally in your browser.

Free a1c to average glucose converter with labeled inputs and an immediate result. It estimates eAG from a laboratory A1C percentage privately in your browser.

Free abbreviation expander replaces common workplace and internet short forms with full phrases. Runs in your browser; no uploads or accounts are used.

Free abv fermentation calculator with labeled inputs and an immediate result. It estimates alcohol by volume from gravity readings privately in your browser.

Convert acres to hectares and hectares to acres using the international area relationship, with six-significant-figure results in your browser.

Free ADFGX cipher combines a keyed Polybius fraction with keyword column transposition. Runs in your browser; no uploads or accounts are used.

Free Alberti cipher disk rotates a movable alphabet by interval, offset, and step controls. Runs in your browser; no uploads or accounts are used.

Free alcohol proof converter that converts US proof and alcohol by volume. Review labeled assumptions and a worked result calculated privately in your browser.

Use this free alpha compositing calculator in your browser to blend foreground alpha over a background into one opaque hex. Output stays private and local.

Free apr to apy calculator with labeled inputs and an immediate result. It converts nominal APR to compounded annual yield privately in your browser.

Free apy to apr calculator with labeled inputs and an immediate result. It converts effective annual yield to nominal APR privately in your browser.

Free arc length calculator with labeled inputs and an immediate result. It finds circular arc length from radius and angle privately in your browser.

Convert standard atmospheres to PSI and PSI to atmospheres using the exact reference pressure, with six-significant-figure results in your browser.

Free autokey cipher encodes and decodes letters with a keyword extended by the message. Runs in your browser; no uploads or accounts are used.

Free average word length calculator reports token count, characters, and mean token length. Runs in your browser; no uploads or accounts are used.

Use this free baseline grid generator in your browser to calculate line height and baseline guides from a font size. Output stays private and local.

Free basic auth encoder for a focused result. It encodes a username and password as an HTTP Basic credential with private local processing in your browser.

Encode or decode text with the reciprocal Beaufort cipher and a repeating alphabetic key, preserving nonletters privately in your browser without uploads.

Free Bifid cipher fractionates keyed Polybius coordinates and recombines them by period. Runs in your browser; no uploads or accounts are used.

Free body surface area calculator with labeled inputs and an immediate result. It estimates adult body surface area with Mosteller privately in your browser.

Free bond current yield calculator with labeled inputs and an immediate result. It compares annual coupon income with market price privately in your browser.

Free book cipher maps message words to first matching positions in a supplied reference passage. Runs in your browser; no uploads or accounts are used.

Free brine percentage calculator with labeled inputs and an immediate result. It calculates salt as a percentage of water weight privately in your browser.

Convert British thermal units to joules and joules to BTU using the standard thermochemical factor, with precise energy results in your browser.

Free cac payback period calculator with labeled inputs and an immediate result. It estimates months to recover acquisition cost privately in your browser.

Convert carats to grams and grams to carats with the exact metric gemstone definition, decimal inputs, and a practical reference table in your browser.

Free catalan number calculator that computes a Catalan sequence value, with labeled assumptions and an immediate result calculated privately in your browser.

Free ceiling fan size helper that suggests a fan span band from room area. Review labeled assumptions and a worked result calculated privately in your browser.

Convert Celsius to Fahrenheit and Fahrenheit to Celsius with the exact affine formulas and clear six-significant-figure results in your browser.

Convert Celsius to kelvins and kelvins to Celsius using the exact 273.15 offset, with precise scientific results calculated in your browser.

Free centripetal force calculator with labeled inputs and an immediate result. It calculates inward force for circular motion privately in your browser.

Free Chaocipher encodes and decodes with two dynamically permuted twenty-six-letter alphabets. Runs in your browser; no uploads or accounts are used.

Free chi-square goodness-of-fit with labeled inputs and an immediate result. It compares observed and expected category counts privately in your browser.

Free cholesterol unit converter with labeled inputs and an immediate result. It converts cholesterol from mg/dL to mmol/L privately in your browser.

Format a basic APA-style web or article citation from author, year, title, publication, and URL fields, then copy it in your browser without uploads.

Free Chicago citation generator orders author, title, publisher, year, and URL details. Runs in your browser; no uploads or accounts are used.

Free Harvard citation generator formats initials, year, title, publisher, and URL fields. Runs in your browser; no uploads or accounts are used.

Free IEEE citation generator creates numbered author, title, publisher, year, and URL entries. Runs in your browser; no uploads or accounts are used.

Free MLA citation generator formats author, title, publisher, year, and URL fields. It runs in your browser without uploads or external requests.

Convert centimeters to decimal feet and feet to centimeters using the international-foot definition, with clear, precise results in your browser.

Convert centimeters to inches and inches to centimeters with an exact metric factor, six-significant-figure results, and a quick table in your browser.

Use this free color luminance matcher in your browser to adjust one color lightness until it matches another relative luminance. Output stays private and local.

Free columnar transposition cipher reorders text by alphabetically ranked keyword columns. Runs in your browser; no uploads or accounts are used.

Free complete the square calculator with labeled inputs and an immediate result. It rewrites a monic quadratic in vertex form privately in your browser.

Free compression ratio calculator with an immediate result. It calculates engine compression from swept and clearance volume privately in your browser.

Calculate a z-based confidence interval for a sample mean from its standard deviation, sample size, and critical value in your browser without uploads.

Free proportion confidence interval with labeled inputs and an immediate result. It estimates a z interval around a sample proportion privately in your browser.

Free contraction expander replaces common English apostrophe forms with their full wording. Runs in your browser; no uploads or accounts are used.

Free two-variable covariance calculator with an immediate result. It calculates population covariance for paired summaries privately in your browser.

Use this free CSS accent color previewer in your browser to preview and copy accent-color CSS for native form controls. Output stays private and local.

Use this free CSS animation stagger generator in your browser to generate nth-child animation delays for a chosen item count. Output stays private and local.

Use this free CSS background position previewer in your browser to preview and copy percentage background positioning CSS. Output stays private and local.

Use this free CSS background size previewer in your browser to preview cover contain or explicit background sizing CSS. Output stays private and local.

Use this free CSS border image generator in your browser to build gradient border-image CSS with slice, width, and repeat. Output stays private and local.

Use this free CSS container query generator in your browser to build named inline-size container query CSS. Output stays private and local. No upload is needed.

Use this free CSS font face generator in your browser to build font-face CSS with source, format, weight, style, and display. Output stays private and local.

Use this free CSS font shorthand builder in your browser to assemble font CSS from style, weight, size, line height, and family. Output stays private and local.

Use this free CSS font stack builder in your browser to assemble an ordered quoted font-family fallback stack. Output stays private and local.

Use this free CSS list style previewer in your browser to preview and copy list marker position type and spacing CSS. Output stays private and local.

Use this free CSS logical properties converter in your browser to translate physical spacing into logical block and inline CSS. Output stays private and local.

Use this free CSS nth-child tester in your browser to evaluate an-plus-b nth-child formulas against a finite item list. Output stays private and local.

Use this free CSS object position previewer in your browser to preview object positioning independently of object fit. Output stays private and local.

Use this free CSS OpenType features previewer in your browser to build font-feature-settings CSS from OpenType feature toggles. Output stays private and local.

Use this free CSS outline generator in your browser to build and preview CSS outline width style color and offset. Output stays private and local.

Use this free CSS perspective playground in your browser to build perspective and 3D rotation CSS with transform origin. Output stays private and local.

Use this free CSS scroll snap generator in your browser to build scroll container and item snap alignment CSS. Output stays private and local.

Use this free CSS selection style generator in your browser to build scoped selection foreground and background CSS. Output stays private and local.

Use this free CSS shape outside generator in your browser to build circular or elliptical shape-outside CSS with shape margin. Output stays private and local.

Use this free CSS subgrid generator in your browser to build parent grid and child subgrid CSS tracks. Output stays private and local. No upload is needed.

Use this free CSS text decoration generator in your browser to build underline overline and strike decoration CSS. Output stays private and local.

Use this free CSS writing mode previewer in your browser to preview vertical and horizontal writing-mode with text orientation. Output stays private and local.

Convert cubic meters to US liquid gallons and gallons to cubic meters using the exact US definition, with precise volume results in your browser.

Convert US cups to milliliters and milliliters to US cups using the standard legal cup volume, with precise recipe-ready results in your browser.

Free date extractor finds ISO and month-first numeric dates in prose and lists them in source order. Runs in your browser; no uploads or accounts are used.

Free digital root calculator with labeled inputs and an immediate result. It reduces an integer through repeated digit sums privately in your browser.

Free discriminant calculator with labeled inputs and an immediate result. It classifies quadratic roots from coefficients privately in your browser.

Free 3d distance calculator with labeled inputs and an immediate result. It finds straight-line distance between spatial points privately in your browser.

Free dnd character stat roller. It rolls six ability scores using four dice and dropping the lowest and keeps entered data private in your browser.

Free duplicate word finder locates accidental adjacent repeats and reports character positions. Runs in your browser; no uploads or accounts are used.

Free cohen d effect size calculator with labeled inputs and an immediate result. It standardizes a two-group mean difference privately in your browser.