Kinetic Energy Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
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Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter mass (kg) and velocity (m/s).
- Read the kinetic energy in joules.
How it works
Kinetic energy = ½ × mass × velocity². Doubling the speed quadruples the energy.
Worked example
10 kg at 5 m/s. KE = ½ × 10 × 25 = 125 J.
Common mistakes
- Forgetting velocity is squared — speed matters far more than mass.
- Mixing units — use kilograms and metres per second for joules.
Frequently asked questions
Why does speed matter so much?
Because velocity is squared: doubling speed multiplies kinetic energy by four.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.