Kinetic Energy Calculator
Calculate the energy of a moving object from its mass and speed using half mass times speed squared. Enter mass and speed to see kinetic energy and…
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Calculate the energy of a moving object from its mass and speed using half mass times speed squared. Enter mass and speed to see kinetic energy and in kilojoules when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (mass = 1,200 kg, speed = 20 m/s), the results are: kinetic energy 240,000 J; in kilojoules 240.00 kJ.
Quick reference: mass vs result
Reference table based on the example values; it is not your calculation result.
| Mass (kg) | Kinetic energy | In kilojoules |
|---|---|---|
| 600 | 120,000 J | 120.00 kJ |
| 1,200 | 240,000 J | 240.00 kJ |
| 2,400 | 480,000 J | 480.00 kJ |
| 6,000 | 1,200,000 J | 1,200.00 kJ |
| 12,000 | 2,400,000 J | 2,400.00 kJ |
| 24,000 | 4,800,000 J | 4,800.00 kJ |
Frequently asked questions
What formula does this calculator use?
Kinetic energy = 0.5 × m × v^2; In kilojoules = 0.5 × m × v^2 ÷ 1000. Variables: m = mass in kg, v = speed in m/s.
What do I need to enter?
You need mass (kg), speed (m/s). Results update as you type.
What is an example result?
With the default inputs (mass = 1,200 kg, speed = 20 m/s), the results are: kinetic energy 240,000 J; in kilojoules 240.00 kJ.
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