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Calculators / Science / Kinetic energy
Kinetic energy calculator
Calculate the energy of a moving object.
On this page
Kinetic energy50,000J
Calculator controls
How to calculate
Calculate the energy of a moving object.
Kinetic energy = ½ × mass × speed²
Worked example
Example inputs
Mass (KG): 1000 · Speed (m/s): 10
Example resultKinetic energy: 50000 J
Assumptions and limits
Classical translational kinetic energy, suitable for speeds well below the speed of light.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Kinetic energy grows linearly with mass and with the square of speed. Doubling speed quadruples the calculated energy.
When this tool is useful
Explore a classical mechanics example for an object moving much slower than light.
Understanding your inputs
| Input | What to enter |
|---|---|
| Mass (kg) | Enter a number of at least 0 and no more than 1000000000000. |
| Speed (m/s) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
Does this include rotational energy?
No. It models translational motion only. Rotation requires the moment of inertia and angular speed.
Can I enter km/h for velocity?
The input expects metres per second. Convert km/h by dividing by 3.6 first.