Physics Equations: Formulas and Calculators
The key GCSE physics equations in one place, plus the SUVAT equations for A-level: V = IR, speed, acceleration, kinetic energy, density and efficiency. Choose what to find, enter the values in any units and get a step-by-step solution.
Mechanics
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Physics equations: frequently asked questions
GCSE physics splits equations into ones you must recall and ones given on the equation sheet. V = IR, distance travelled = speed × time, acceleration = change in velocity ÷ time taken, kinetic energy = 0.5 × mass × (speed)², density = mass ÷ volume and efficiency are all ones to learn by heart; your exam board's specification has the full list.
Yes. Every board provides a sheet of the less common 'select and apply' equations, such as v² − u² = 2as. The core equations, such as V = IR and ρ = m/V, are not on it, so you need to memorise them.
Yes. Every calculator works in the browser on a phone, tablet or computer, with no sign-up and no limit on how many problems you solve.
Yes. Pick the unit next to each value, for example km/h, min, mA, kJ or g/cm³, and the solution shows the conversion to SI units before substituting.