Kinetic Energy Calculator (½mv²)

Find kinetic energy from mass and velocity.

Last updated: 25 Aug 2026

Quick answer

Kinetic energy is ½ × mass × velocity². For example, 10 kg at 5 m/s has 125 joules of kinetic energy. Enter mass and velocity above.

Mass (kg)

Velocity (m/s)

Find kinetic energy using KE = ½ × m × v². Mass in kg and velocity in m/s give energy in joules.

How to calculate kinetic energy

What is the kinetic energy formula?

KE = ½ × mass × velocity², in joules for kg and m/s.

Why is velocity squared?

Energy rises with the square of speed, so doubling speed quadruples kinetic energy.

What is potential energy?

Energy from position (PE = mgh); kinetic energy is energy of motion.