Science Tools

Free physics and chemistry calculators — Ohm's law, LED resistors, voltage dividers, density, force, the ideal gas law, pH, and molar mass — computed instantly and privately in your browser.

Motion, force and energy

Force Calculator (F=ma)

Newton's second law: enter any two of force, mass and acceleration to compute the third.

Kinetic Energy Calculator

Solve kinetic energy, mass, or velocity from KE = ½mv², with velocity in m/s, km/h, mph, or ft/s.

🎯

Projectile Motion Calculator

Compute range, maximum height, time of flight, and impact velocity from launch speed, angle, and height.

Torque Calculator

Solve torque, radius, force, or angle from τ = r·F·sinθ, with results in N·m and lb·ft.

🪐

Gravitational Force, Escape & Orbital Velocity Calculator

Compute Newton's gravitational force F=Gm1m2/r², plus escape and orbital velocities, solving for any variable.

🎱

Momentum & Impulse Calculator

Solve linear momentum p=mv and impulse J=FΔt=mΔv for any variable, with change in velocity from impulse.

⚙

Work, Energy & Power Calculator

Solve mechanical work W=F·d·cosθ and power P=W/t for any variable, in joules and watts.

Density Calculator

Enter any two of density, mass and volume to compute the third using density = mass / volume.

Chemistry calculations

Molar Mass Calculator

Type a chemical formula to get its molar mass in g/mol and a per-element breakdown.

Molarity & Dilution Calculator (C1V1=C2V2)

Find molarity from mass and molar mass, solve any variable of the C1V1=C2V2 dilution equation, or plan a serial dilution.

pH Calculator

Enter pH, pOH, [H+] or [OH-] and get the others plus acidic, neutral or basic.

⚗

Stoichiometry (Mole-Ratio) Calculator

Convert between two species in a balanced reaction using their coefficients and the mole ratio, in moles or grams.

Percent Yield Calculator

Solve percent yield, actual yield, or theoretical yield from % yield = actual ÷ theoretical × 100.

🧪

Beer–Lambert Law Calculator

Solve A = ε·l·c for absorbance, molar absorptivity, path length or concentration, with %-transmittance.

Gases and heat

Ideal Gas Law (PV=nRT)

Solve PV = nRT for any variable by entering the other three, with R = 8.314.

P⇌

Gas Laws Calculator (Boyle / Charles / Gay-Lussac / Combined)

Two-state gas law solver for P₁V₁/T₁ = P₂V₂/T₂ — pick Boyle, Charles, Gay-Lussac, or combined and solve any variable.

🔥

Specific Heat Calculator (Q=mcΔT)

Solve heat, mass, specific heat, or temperature change from Q = mcΔT, with presets for common substances.

Light, charge and decay

🔦

Snell's Law / Refraction Calculator

Solve n1·sinθ1 = n2·sinθ2 for any angle or refractive index, with critical-angle and total-internal-reflection detection.

⚡

Coulomb's Law Calculator

Solve F = k·q1q2/r² for force, charge or separation, with attraction/repulsion detection and µC/nC/C units.

☢

Half-Life / Radioactive Decay Calculator

Solve remaining amount, initial amount, half-life, or elapsed time from N = N₀·(½)^(t/T), with decay constant and mean lifetime.

Heat stress and wind chill

🥵

Heat Index (Feels-Like) Calculator

Calculate the feels-like temperature from heat and humidity with the NWS Rothfusz heat index equation, in °F or °C.

🥶

Wind Chill Calculator

Calculate the wind chill feels-like temperature from cold and wind speed using the NWS/Environment Canada formula, imperial or metric.

🥵

Humidex Calculator

Compute the Canadian humidex — the perceived 'feels-like' temperature combining heat and humidity — from air temperature and dew point.

🌡️

Wet-Bulb Temperature Calculator

Find the wet-bulb temperature — the lowest temperature reachable by evaporative cooling — from air temperature and relative humidity.

💧

Dew Point Calculator

Calculate the dew point from your air temperature and relative humidity using the Magnus-Tetens formula, in °C or °F.

Humidity and moisture

💧

Relative Humidity Calculator

Calculate relative humidity from air temperature and dew point using the Magnus formula — the inverse of a dew-point calculator.

💦

Absolute Humidity Calculator

Compute absolute humidity — the actual mass of water vapor per cubic meter of air (g/m³) — from temperature and relative humidity.

🌫️

Water Vapor Pressure Calculator

Compute saturation and actual water-vapor pressure plus vapor-pressure deficit from temperature and relative humidity via the Magnus equation.

🌬️

Mixing Ratio & Specific Humidity Calculator

Find the mixing ratio (g water vapor per kg dry air) and specific humidity from temperature, relative humidity, and station pressure.

❄️

Frost Point Calculator

Calculate the frost point — the temperature at which frost deposits as ice — from air temperature and relative humidity, distinct from dew point.

Rain and snow

🌨️

Snow-to-Liquid Ratio Calculator

Convert liquid precipitation to snowfall depth or back using a snow-to-liquid ratio, with an optional temperature-based ratio estimate.

🌧️

Roof Rainwater Runoff Calculator

Estimate the water volume running off a roof or catchment from its footprint area, rainfall depth, and a runoff coefficient — for rain-barrel sizing.

No tools match that.