Science · free · no sign-up
Physics calculator
A quick calculator for Newton's second law: find force or mass from the other quantities.
Physics Force
F = m × a · Mass · Acceleration
F = m × a | Force in Newtons (N)
Physics recycles a compact set of ideas: motion, forces, energy, power and waves explain most of what the subject asks. This general physics calculator gathers the core calculations in one place, each with the right formula and units.
How to use this calculator
- Choose the topic: motion, force, energy, power or waves.
- Enter the values your problem gives.
- Press calculate to see the result with its unit.
The universal survival skill: units
Nearly every physics error is a unit error in costume: kilometres per hour fed into a metres-per-second formula, grams where kilograms belong. Convert to SI first (metres, kilograms, seconds), calculate second, then convert the answer if the question wants another unit. This calculator's inputs are labelled to force exactly that habit.
Frequently asked questions
What formulas does a physics calculator cover?
The core set: speed and acceleration, F = ma, weight, kinetic and potential energy, power, momentum, density, pressure and the wave equation.
How do I know which formula a problem needs?
List what you are given and what you are asked for; the formula containing exactly those quantities is almost always the intended one.
Why do my answers differ from the textbook by rounding?
Textbooks often use g = 10 m/s² for speed while precise work uses 9.81. Small differences of that kind are convention, not error.