Kinetic energy calculator

Kinetic energy = ½ × mass × speed².

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Mass (kg)

Speed (m/s)

Answer

…

Kinetic energy = ½ × mass × speed².

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

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Formula and assumptions

Classical translational energy only; rotational energy and relativistic effects are excluded.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Kinetic energy calculator

Kinetic energy = ½ × mass × speed².

Classical translational energy only; rotational energy and relativistic effects are excluded.

Next: Impulse calculator

A worked example

With mass (kg) = 10, speed (m/s) = 3, the kinetic energy (j) is 45.

Next: Work calculator

Before you use the result

Classical translational energy only; rotational energy and relativistic effects are excluded.

Example results for mass (kg)

These examples use Speed (m/s): 3. They are reference calculations, not recommended settings.

Mass (kg)	Kinetic energy (J)
5	22.5
10	45
20	90

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