Physics Calculators

Calculate speed, distance, or time using the fundamental velocity equation.

Calculate force, mass, or acceleration using Newton's second law (F = ma).

Calculate kinetic energy, mass, or velocity using KE = 1/2 mv².

Calculate voltage, current, or resistance using Ohm's law (V = IR).

Calculate range, max height, and flight time for projectile motion.

Calculate the mass of any element given its volume using density data for all 118 elements.

Calculate the volume of any element given its mass using density data for all 118 elements.

Convert between common units of length, weight, temperature, speed, and more.

Calculate your electricity bill from power usage, time, and rate — or solve for any variable.

Look up AWG wire diameter, cross-section area, resistance, and max ampacity.

Convert between decibels and power or voltage ratios, and add dB levels.

Calculate wavelength, frequency, period, or energy of electromagnetic waves.

See how much you would weigh on Mars, Jupiter, the Moon, and other planets.

Decode resistor color bands to find resistance value and tolerance.

Calculate gear ratio, output speed, and torque from driving and driven gear teeth.

Convert between Pa, bar, psi, atm, mmHg, Torr, and other pressure units.

Calculate heat transfer rate through materials using Fourier's Law of conduction.

Calculate spring constant from force and displacement or mass and period.

Calculate image distance, magnification, and image characteristics using the thin lens equation (1/f = 1/do + 1/di).

Calculate the period, frequency, and length of a simple pendulum using T = 2π√(L/g).

Calculate buoyant force, determine if an object floats or sinks, and find the submerged fraction.

Calculate centripetal force, mass, velocity, or radius for circular motion using F = mv²/r.

Calculate the observed frequency shift from source and observer velocities using the Doppler effect formula.

Calculate remaining amount, half-lives elapsed, and activity of a radioactive substance over time.

Calculate electrical power, voltage, current, and resistance using P=IV, P=I²R, and P=V²/R.

Calculate capacitance, charge, energy stored, and series/parallel capacitor combinations.

Calculate inductance, energy stored, time constant, and series/parallel inductor combinations.

Calculate transformer turns ratio, output voltage, and output current from input values and winding turns.