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Kinetic energy

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Kinetic energy diagram
The classical expression for kinetic energy is used to calculate any of mass, velocity, or energy from the other two.
Mass is
Velocity is
Kinetic energy is

Gives a mass of
Gives a velocity of
Gives an energy of
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This energy calculation is based on classical mechanics and therefore does not take relativistic effects into account. Fill in any two of the inputs, and the third variable will be calculated in the relevant output box. Ignore boxes marked "0", "Infinity" or "NaN".
This calc may be used, e.g. to calculate the energy of a bullet and to find what speed a 1 kg weight would need to be traveling to have the same amount of energy.