Science
Kinetic Energy Calculator
Translational kinetic energy from mass and velocity, with common unit equivalents.
Inputs
Kinetic Energy Calculator
Result
Kinetic energy
300,000 J
- Kilojoules
- 300 kJ
- Calories
- 71,701.72 cal
- Watt-hours
- 83.333 Wh
How it's calculated
KE = ½ · m · v²
Common questions
Why does doubling speed quadruple the energy?
Kinetic energy scales with the square of velocity. Doubling v multiplies v² by 4 — this is why high-speed crashes are disproportionately destructive.
Does this include rotational energy?
No — this is translational kinetic energy only. Spinning objects also carry rotational KE = ½·I·ω², which requires the moment of inertia.
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