Kinetic Energy Calculator
Use KE = ½ × m × v²
Enter Values
Mass must be 0 or greater.
Velocity may be negative, but kinetic energy stays non-negative because velocity is squared.
Results appear only after clicking Calculate. Changing a unit resets only that field to 0 and focuses it for re-entry.
Action
Results
Energy
0 J
Energy
0 kJ
Energy
0 Wh
Energy
0 kWh
Energy
0 ft·lbf
Use this Kinetic Energy Calculator to estimate the translational kinetic energy of an object from its mass and velocity.
Calculation Method
KE = ½ × m × v²
Where m is mass and v is velocity or speed.
Example
For a 10 kg object moving at 6 m/s:
KE = ½ × 10 × 6²
KE = 180 J
Because velocity is squared, doubling speed makes kinetic energy four times larger when mass remains unchanged.
Important Note
This formula calculates classical translational kinetic energy only. It does not include rotational energy and should not be used for objects moving close to the speed of light, where relativistic equations are required.