About these calculators
Free physics calculators that show their working. Each one gives the formula, the substitution with your numbers and the final answer with units, so you can check homework and understand every step. No sign-up needed.
Motion and Kinematics Calculators
R = v₀² sin 2θ / g
Projectile Motion Calculator
Range, maximum height and time of flight from speed and angle.
Force, Energy and Momentum Calculators
F = ma
Newton’s Second Law Calculator (F = ma)
Find force, mass or acceleration with Newton’s second law.
GPE = mgh
Gravitational Potential Energy Calculator
Energy gained by raising a mass, on Earth or any planet.
Electricity, Waves and Light Calculators
c = 299,792,458 m/s
Speed of Light Calculator
Light travel time, distance, and speed in water or glass.
How Our Physics Calculators Work
Every calculator uses standard SI units: metres, kilograms, seconds, newtons, joules, volts and so on. Type your values, press Calculate, and the result appears together with a numbered list of steps. Very large or very small answers are shown in standard form, such as 3.0 × 10⁸.
The calculators use the same equations taught in GCSE, A-Level, AP Physics, IB and first-year university courses, and they ignore effects such as air resistance unless stated. Each calculator page also explains the formula and includes a worked example you can check against the calculator.
Tip: Use the calculator to check your answer after you have worked it out by hand. Comparing the steps is the fastest way to spot where a mistake crept in.