Health & Fitness Tools
Fitness and nutrition calculators: BMI, BMR and TDEE, macro splits, body fat (Navy and Army methods), ideal and lean body weight, running pace and race time predictions, and calorie deficit planning. They give estimates for planning, not medical advice.
Macro Split Calculator
Free macro split calculator that converts daily calories plus protein, carb, and fat percentages into grams per day locally for meal planning.
Open ToolRunning Pace Calculator
Free running pace calculator: enter distance and time to get your pace per kilometre and per mile plus average speed, all in your browser.
Open ToolNavy Body Fat Calculator
Free Navy body fat calculator: estimate body-fat percentage with the U.S. Navy tape-measure formula from neck, waist, hips, and height. No calipers needed.
Open ToolPregnancy Due Date Estimator
Free due date estimator using Naegele’s rule (last period + 280 days), showing your estimated due date, gestational age, and trimester — in your browser.
Open ToolCalorie Deficit Planner
Free calorie deficit planner that estimates timeline from pounds to lose, daily deficit, and the classic 3500 calorie shortcut in your browser.
Open ToolBMI Calculator
Free BMI calculator for adults that converts pounds and inches into body mass index, standard category bands, and a clear local estimate for planning.
Open ToolBMI Prime Calculator
Free BMI Prime calculator: express your BMI as a ratio to the upper-normal limit, computed locally in your browser.
Open ToolBMR Calculator
Free BMR calculator using the Mifflin St Jeor equation to estimate resting daily calories from age, sex, height, and weight inputs in your browser.
Open ToolBody Frame Size Calculator
Free body frame size calculator: find your frame from height and wrist circumference, computed in your browser.
Open ToolRace Time Predictor
Free race time predictor using Riegel’s formula to estimate a finish time at another distance, in your browser.
Open ToolWater Intake Estimator
Free water intake estimator that uses body weight and activity minutes to produce a simple daily fluid target in ounces and liters for planning.
Open ToolHeart Rate Zone Calculator
Free heart-rate zone calculator using the Tanaka max-HR formula and optional Karvonen method, computing your five training zones in the browser.
Open ToolHydration During Run Calculator
Calculate fluid needed from hours running and an hourly fluid rate. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolIdeal Weight Range Calculator
Free ideal weight range calculator comparing Devine and Robinson formula estimates from height and sex, with pounds and kilograms shown locally.
Open ToolIV Drip Rate Calculator
Free iv drip rate calculator with labeled inputs and an immediate result. It calculates a theoretical gravity drip rate privately in your browser.
Open ToolPace to Speed Calculator
Free pace to speed calculator: convert running pace into speed in km/h and mph, computed in your browser.
Open ToolRPG Gold Split Calculator
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.
Open ToolSleep Cycle Bedtime Calculator
Free bedtime calculator that counts back 90-minute sleep cycles from your wake time so you wake between cycles feeling rested — runs in your browser.
Open ToolSteps to Distance Estimator
Free steps-to-distance estimator: convert a step count into kilometres and miles from your stride length or height, computed privately in your browser.
Open ToolTarget Weight Date Calculator
Free target weight date calculator: estimate when you will reach a goal weight at a steady rate, in your browser.
Open ToolWilks Calculator
Calculate a classic Wilks coefficient and score from bodyweight, lifted total, and coefficient category in kilograms, privately in your browser.
Open ToolArmy Body Fat Calculator
Free U.S. Army body fat calculator using the circumference method, computed locally in your browser.
Open ToolCampaign Budget Split Calculator
Split a campaign budget across creative, media, landing pages, testing, tools, and contingency.
Open ToolIdeal Weight Calculator
Free ideal body weight calculator using the Devine and Robinson formulas from your height and sex, computed locally in your browser.
Open ToolJoules to Calories Converter
Convert joules to thermochemical calories and calories to joules using the standard energy factor, with precise results calculated in your browser.
Open ToolMacros to Calories Calculator
Free macros to calories calculator: turn protein, carbs, and fat grams into calories and percentages, in your browser.
Open ToolMobility Session Time Calculator
Calculate session length from an exercise count and minutes each. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolPace Band Calculator
Calculate pace per mile and 5K split targets from race distance and goal time inputs. It runs entirely in your browser — no uploads or accounts.
Open ToolProtein Per Meal Calculator
Calculate protein per meal from a daily target and a meal count. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolReading Assignment Pace Calculator
Calculate pages per day from total pages and days available. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolSweat Rate Calculator
Calculate sweat rate from fluid lost and hours exercised. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolTDEE Calculator
Free TDEE calculator that estimates BMR, applies an activity factor, and shows daily maintenance calories with the formula visible in your browser.
Open ToolCalorie Deficit Calculator
Free calorie deficit calculator: find the daily deficit needed for a target weekly weight loss, in your browser.
Open ToolCalories Burned Calculator
Free calories burned calculator using MET values for common activities, from your weight and duration, computed in your browser.
Open ToolCalories Burned Walking
Free calories burned walking calculator from your weight, time, and pace, computed locally in your browser.
Open ToolCarb Cycling Day Calculator
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.
Open ToolLean Body Mass Calculator
Free lean body mass calculator using the Boer formula from your weight, height, and sex, computed locally in your browser.
Open ToolMax Heart Rate Calculator
Free maximum heart rate calculator using age-based formulas, computed locally in your browser.
Open ToolOne Rep Max Comparison
Compare Epley, Brzycki, and Lombardi one-rep max estimates from lifted weight and reps. It runs entirely in your browser — no uploads or accounts.
Open ToolOne-Rep Max Calculator
Free one-rep max calculator using the Epley and Brzycki formulas, with percentage training loads, all computed privately in your browser.
Open ToolOvulation Window Calculator
Estimate ovulation day and fertile window from the first day of your last period and your cycle length. It runs entirely in your browser — no uploads or accounts.
Open ToolPace & Speed Calculator
Free pace and speed calculator: convert distance and time into pace per km and mile plus speed, computed locally in your browser.
Open ToolPlate Loading Calculator
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.
Open ToolProtein Calculator
Free protein calculator: find how many grams of protein you need a day from your body weight and training goal, computed privately in your browser.
Open ToolSplit Calculator
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.
Open ToolSteps to Distance Calculator
Free steps to distance calculator: convert a step count into kilometres, miles, and calories from your stride and weight, in your browser.
Open ToolSwim Pace Calculator
Free swim pace calculator: convert distance and time into pace per 100 metres and speed, computed locally in your browser.
Open ToolTonnage Workout Calculator
Calculate workout tonnage from weight, reps, and sets. Everything is computed locally in your browser, with no uploads and no sign-ups.
Open ToolVO2 Max Estimator
Free VO2 max estimator from your resting and maximum heart rate, computed locally in your browser with nothing uploaded.
Open ToolWaist-to-Height Ratio Calculator
Free waist-to-height ratio calculator: gauge health risk from your waist and height, computed locally in your browser.
Open ToolWaist-to-Hip Ratio Calculator
Free waist-to-hip ratio calculator with health-risk categories by sex, computed locally in your browser.
Open ToolWater Intake Calculator
Free daily water intake calculator based on body weight and exercise, computed locally in your browser with no data uploaded.
Open ToolCalories Activity MET Calculator
Calculate calories burned from MET value, body weight, and minutes with the standard exercise formula. It runs locally in your browser with no uploads.
Open ToolFat Macro Gram Calculator
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.
Open ToolFFMI Calculator
Free FFMI calculator: work out your fat-free mass index and normalized value from weight, height, and body fat, in your browser.
Open ToolWalking Commute Calories Calculator
Calculate calories burned from minutes walking and calories per minute. Everything is calculated locally in your browser, with no uploads or sign-ups.
Open ToolWatts per Kilogram Calculator
Free watts per kilogram calculator with labeled inputs and an immediate result. It normalizes cycling power by body mass privately in your browser.
Open ToolSleep Cycle Calculator
Free sleep cycle calculator: find the best bedtimes to wake refreshed between 90-minute cycles, in your browser.
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