80 free tools · Private · In-Browser

Science & Engineering Tools

Physics, chemistry and engineering calculators: kinematics, kinetic and potential energy, momentum and impulse, gas laws, dilution (C1V1 = C2V2) and molarity, resistor color codes, dew point and decibels. Each one lists the formula it uses and the units it expects.

Frequency Converter

Free frequency converter: convert between hertz, kilohertz, megahertz, and gigahertz, in your browser.

Kinematics Calculator

Calculate final velocity and displacement from initial velocity, constant acceleration, and elapsed time with results in your browser without uploads.

Work Done Calculator

Free work done calculator: find mechanical work from force, distance, and angle, computed in your browser.

Bernoulli Equation Calculator

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

Moment of Inertia Calculator

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

Resistor Color Code Decoder

Free resistor color code decoder: pick 4 or 5 bands to read the resistance value and tolerance, computed locally in your browser.

Buoyancy Force Calculator

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

Decibel Distance Calculator

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

Decibel Ratio Calculator

Free decibel calculator: convert between a ratio and decibels for power or amplitude, computed locally in your browser.

Efficiency Calculator

Free efficiency calculator: find the efficiency of a machine or process from output and input energy, in your browser.

Hooke’s Law Calculator

Free Hooke’s law calculator: find spring force from the spring constant and displacement, in your browser.

Inductive and Capacitive Reactance

Free inductive and capacitive reactance with labeled inputs and an immediate result. It calculates AC reactance at a chosen frequency privately in your browser.

Kinetic Energy Calculator

Free kinetic energy calculator: find the energy of a moving object from mass and speed with KE = ½mv², in your browser.

LC Resonant Frequency Calculator

Free lc resonant frequency calculator with labeled inputs and an immediate result. It finds ideal inductor-capacitor resonance privately in your browser.

LED Resistor Calculator

Free LED series resistor calculator: enter supply voltage, LED forward voltage, and current to get the resistor value and power, in your browser.

Percent Yield Calculator

Free percent yield calculator: find reaction yield from actual and theoretical amounts, in your browser.

Power Calculator

Free power calculator: find power from work done and time taken, computed locally in your browser.

Wavelength ↔ Frequency

Free wavelength and frequency converter: enter one to get the other for light in a vacuum using c = λf, computed locally in your browser.

Capacitor Code Decoder

Free capacitor code decoder: enter a three-digit ceramic capacitor code to get the capacitance in pF, nF, and µF, computed locally in your browser.

Capacitor Energy Calculator

Free capacitor energy calculator: find the energy stored in a capacitor from capacitance and voltage, computed in your browser.

Capacitors in Parallel Calculator

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

Combined Gas Law Calculator

Free combined gas law calculator: solve P1V1/T1 = P2V2/T2 for a missing value, in your browser.

Dilution Calculator (C1V1=C2V2)

Free dilution calculator: solve C1V1 = C2V2 for the missing value when diluting a solution, in your browser.

Free Fall Calculator

Free free fall calculator with labeled inputs and an immediate result. It estimates ideal fall speed and distance from time privately in your browser.

Heat Conduction Rate Calculator

Free heat conduction rate calculator with an immediate result. It estimates steady one-dimensional conductive heat flow privately in your browser.

Inelastic Collision Calculator

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

Potential Energy Calculator

Free gravitational potential energy calculator: find stored energy from mass, gravity, and height with PE = mgh, in your browser.

Projectile Motion Calculator

Free projectile motion calculator: find range, maximum height, and flight time from launch speed and angle, in your browser.

Projectile with Height Calculator

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

Relativistic Time Dilation Calculator

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.

Reynolds Number Calculator

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

Specific Gravity Calculator

Free specific gravity calculator: find specific gravity from density relative to water, in your browser.

Spring Frequency Calculator

Free spring frequency calculator with labeled inputs and an immediate result. It finds ideal mass-spring natural frequency privately in your browser.

Standing Wave Calculator

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

Terminal Velocity Calculator

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

Voltage Divider Calculator

Free voltage divider calculator: enter input voltage and two resistors to get the output voltage and current, computed locally in your browser.

Voltage Drop Calculator

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

Boyle’s Law Calculator

Free Boyle’s law calculator: solve P1V1 = P2V2 for the missing pressure or volume, in your browser.

Centripetal Force Calculator

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

Charles’s Law Calculator

Free Charles’s law calculator: solve V1/T1 = V2/T2 for the missing volume or temperature, in your browser.

Coulomb’s Law Calculator

Free Coulomb’s law calculator: find the electrostatic force between two charges at a distance, computed in your browser.

Density Calculator

Free density calculator: find density, mass, or volume from the other two with ρ = m/V, computed in your browser.

Doppler Effect Calculator

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

Elastic Collision Calculator

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

Force Calculator (F = ma)

Free force calculator using Newton’s second law: solve force, mass, or acceleration from the other two, in your browser.

Grams to Moles Calculator

Free grams to moles calculator: convert mass to moles using molar mass, computed in your browser.

Gravitational Force Calculator

Free gravitational force calculator using Newton’s law of gravitation between two masses, in your browser.

Half-Life Calculator

Free half-life calculator: find how much of a substance remains after a time from its half-life, in your browser.

Heat Index Calculator

Free heat index calculator: find the feels-like temperature from heat and humidity using the NWS formula, in your browser.

Ideal Gas Law Calculator

Free ideal gas law calculator: enter any three of pressure, volume, moles, and temperature to solve for the fourth using PV = nRT, in your browser.

Impulse and Momentum Calculator

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

Inclined Plane Calculator

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

Kepler's Third Law Calculator

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

Lab Dilution Factor Calculator

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

Mass Percent Calculator

Free mass percent calculator: find the mass percent of a solute in a solution, computed in your browser.

Mass-Energy Calculator (E=mc²)

Free E=mc² calculator: find the energy equivalent of a mass, computed locally in your browser.

Molar Mass Calculator

Free molar mass calculator: enter a chemical formula to get its molar mass from standard atomic weights, with parentheses supported, in your browser.

Molarity Calculator

Free molarity calculator: find solution concentration in moles per litre from moles and volume, in your browser.

Moles to Grams Calculator

Free moles to grams calculator: convert moles to mass using molar mass, computed in your browser.

Momentum Calculator

Free momentum calculator: find linear momentum from mass and velocity, computed locally in your browser.

Ohm’s Law Calculator

Free Ohm’s law calculator: enter any two of voltage, current, and resistance to find the third plus power, computed locally in your browser.

Orbital Velocity Calculator

Free orbital velocity calculator that estimates ideal circular-orbit speed. Review labeled assumptions and a worked result calculated privately in your browser.

Pendulum Period Calculator

Free pendulum period calculator with labeled inputs and an immediate result. It estimates the small-angle pendulum period privately in your browser.

pH Calculator

Free pH calculator: convert between hydrogen ion concentration and pH, with pOH, computed locally in your browser.

PPM Converter

Free PPM calculator: convert between parts per million, percent, and mg/L, computed locally in your browser.

RC Time Constant Calculator

Free RC time constant calculator: find the time constant and cutoff frequency from resistance and capacitance, in your browser.

Series & Parallel Resistance

Free resistance calculator: paste resistor values to get the total in series and in parallel at once, computed locally in your browser.

Snell’s Law Calculator

Free Snell’s law calculator: find the refraction angle from refractive indices and the incident angle, in your browser.

Specific Heat Calculator

Free specific heat calculator: find the heat energy to change a mass by a temperature using Q = mcΔT, in your browser.

Torque Converter

Free torque converter: convert between newton-metres, foot-pounds, inch-pounds, and kilogram-force metres, in your browser.

Voltage Drop Percent Calculator

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.

Wave Speed Calculator

Free wave speed calculator: find wave speed from frequency and wavelength, computed in your browser.

Wind Chill Calculator

Free wind chill calculator using the official formula: enter temperature and wind speed to get the feels-like temperature, in your browser.

Atoms to Moles Calculator

Free atoms to moles calculator: convert between a number of particles and moles using Avogadro’s number, in your browser.

Capacitors in Series Calculator

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

Dew Point Calculator

Free dew point calculator: find the dew point from temperature and relative humidity with the Magnus formula, in your browser.

Equity Dilution Calculator

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

Heat Conduction Calculator

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

Percent Composition Calculator

Free percent composition calculator: find each element’s mass percent in a compound, computed in your browser.

Pressure Calculator

Free pressure calculator: find pressure from force and area, in pascals, kPa, and psi, in your browser.