Science
Kinetic energy calculator
Mass and velocity → kinetic energy (½ m v²) in joules.
- Instant
- Free
- Private (processed locally)
- No sign-up
Calculate kinetic energy
Enter the mass (kg) and velocity (m/s). The tool applies E = ½ m v² and gives the result in joules and kilojoules.
Key points
- m in kg, v in m/s, E in joules
- km/h → m/s: divide by 3.6
- Speed ×2 → energy ×4
- 1 kJ = 1000 J
Example
| Input | Value |
|---|---|
| Mass | 2 kg |
| Velocity | 3 m/s |
| Kinetic energy | 9 J |
| In kilojoules | 0.009 kJ |
100% local calculation, no data sent.
Frequently asked questions
What is the formula?
E = ½ × m × v², with m in kg and v in m/s. The result is in joules.
Example calculation?
2 kg at 3 m/s → ½ × 2 × 3² = 9 J.
What if I have km/h?
Convert: speed in m/s = km/h ÷ 3.6. Then apply the formula.
Why velocity squared?
Energy grows with the square of speed: doubling speed quadruples the energy.