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Kinetic Energy Calculator
Enter mass and speed — kinetic energy updates instantly.
Formula
KE = ½ · m · v²
Examples
A 1500 kg car at 25 m/s (90 km/h): KE = ½·1500·625 = 469 kJ. Double the speed and the energy quadruples — that is why braking distance grows with v².
FAQ
Why does speed matter squared?
KE depends on v², so 120 km/h carries four times the energy of 60 km/h — and needs about four times the braking work.
What units does the result use?
Joules (kg·m²/s²). The calculator also shows kJ and kWh for comparisons with electricity and fuel.