Kinetic and Potential Energy Calculator

Find kinetic energy (½mv²) or gravitational potential energy (mgh).

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Fractions and decimals both work.
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Energy
In kilojoules
In other units
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Energy Formulas

Kinetic energy KE = ½ m v²   Potential energy PE = m g h, g = 9.80665 m/s²

Mass in kilograms, speed in m/s and height in meters give energy in joules. Doubling speed quadruples kinetic energy.

Worked Example

Tips

The speed-from-height line assumes all potential energy turns into kinetic energy (no air resistance or friction): v = √(2gh).