Find Newtonian kinetic energy K = ½ m v² in joules.
| Kinetic energy (J) | – |
Use this calculator for the classical kinetic energy of a rigid mass. A 1000 kg car at 20 m/s (72 km/h) has 200 kJ. Double the speed and K quadruples because speed is squared. The sign of v does not matter.
Mass must be greater than zero. This is the Newtonian formula, not the relativistic (γ − 1) m c² expression, so keep speeds well below c.
Mass (kg): Mass in kilograms.
Speed (m/s): Speed; sign does not matter because it is squared.
Kinetic energy (J): ½ m v².
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