Kinetic Energy Calculator

Calculate kinetic energy (½mv²) and momentum (mv). Uses SI units by default.

Mass (m)
(kg)

Kilograms (kg).

Speed (v)
(m/s)

Meters per second (m/s).

Formulas

Kinetic energy: KE = ½ m v²
Momentum: p = m v

Energy is in Joules (J).

Kinetic energy

—

Joules (J)

Momentum

—

kg·m/s

Speed conversions

—

m/s • km/h • mph

Equation

—

This is classical kinetic energy (non-relativistic). At very high speeds, relativistic effects matter.