About the Kinetic Energy Calculator
What is the Kinetic Energy Calculator?
Kinetic energy is the energy an object has because it is moving. It grows with the square of speed, so doubling speed quadruples the energy – the reason high-speed crashes are so much more severe.
Enter the mass and speed. The calculator also shows momentum and the height the object would need to fall from to reach the same speed.
How to use the Kinetic Energy Calculator
- Mass (kg) (sample: 1,000)
- Speed (sample: 72)
- Speed Unit (sample: km/h)
- Press Calculate Kinetic Energy (results also refresh as you type). The result card shows the Kinetic Energy, along with In joules, Momentum, Speed in m/s and Equivalent fall height (v² ÷ 2g).
Formula used
KE = ½ × m × v²
- m = mass in kg
- v = speed in m/s (km/h ÷ 3.6)
- Momentum = p = m × v
Kinetic energy is in joules; 1 kJ = 1,000 J.
Worked example
These are the sample values already filled in the calculator above, and the result it returns for them:
| Input | Sample value |
|---|---|
| Mass (kg) | 1,000 |
| Speed | 72 |
| Speed Unit | km/h |
| Result | Value |
|---|---|
| Kinetic Energy | 200 kJ |
| In joules | 2,00,000 J |
| Momentum | 20,000 kg·m/s |
| Speed in m/s | 20 m/s |
| Equivalent fall height (v² ÷ 2g) | 20.39 m |
| In kilowatt-hours | 0.055556 kWh |
Tips for using the Kinetic Energy Calculator
- Convert km/h to m/s by dividing by 3.6 before using the formula.
- Braking distance rises roughly with the square of speed, just like kinetic energy.