Calculate the energy of a moving object from its mass and speed.
How the kinetic energy calculator works
KE = ½ × m × v², where m is mass in kilograms and v is speed in metres per second. The result is in joules.
Example
A 1,200 kg car moving at 25 m/s has 0.5 × 1,200 × 25² = 375,000 J, or 375 kJ.
Frequently asked questions
Why is velocity squared?
Doubling speed quadruples the kinetic energy, so fast objects carry much more energy.
How do I convert km/h to m/s?
Divide by 3.6. For example, 90 km/h is 25 m/s.
What unit is the answer in?
Joules (J). 1,000 joules is 1 kilojoule (kJ).