Tools that run in the browser. Nothing to install, no account needed.
School calculations
Eight relations most often needed when working through a problem: uniform acceleration, Newton's second law, Ohm's law, kinetic and potential energy, density, power. Fill in every quantity but one and the last is worked out.
Unit converter
Converting units: length, mass, time, speed, energy, power, pressure, volume, temperature. Shows the value in every unit of the group at once, not only in the one you asked for.
Physical constants
A reference of 75 values from the CODATA 2022 adjustment: the speed of light, the Planck constant, the gravitational constant, particle masses, unit relationships. With a search and the published uncertainties.
Planned
A calculator for the optics formulas, and a kinematics solver that shows its working. If there is a tool you need and it is not here, write to us: the queue is ordered by what people actually ask for.