Power Calculator

Power Formula

Worked Example

Doing 15,000 J of work in 60 seconds:

1. P = W ÷ t
2. P = 15000 ÷ 60
3. P = 250 W

In kW: 0.25 kW · In MW: 0.00025 MW · In hp: 0.3352555224 hp

Power from force and speed

For a steady force moving at constant speed, P = Fv. A car pushing against 500 N of drag at 30 m/s needs 15 kW at the wheels.

More Energy, Work and Momentum Calculators

• Kinetic Energy Calculator

  KE = ½ m v²

  KE kinetic energy (J), m mass (kg), v speed (m/s)

  Example: A 20 kg object moving at 10 m/s: Kinetic energy KE = 1000 J.

  Open the kinetic energy calculator →

• Work Calculator

  W = F d cos θ

  W work (J), F force, d displacement, θ angle between force and motion

  Example: Pulling a sled 10 m with 50 N at 60° to the ground: Work W = 250 J.

  Open the work calculator →

• Potential Energy Calculator

  PE = m g h

  PE potential energy (J), m mass, g gravitational acceleration, h height above the reference level

  Example: Lifting a 10 kg box 10 m on Earth: Potential energy PE = 980.665 J.

  Open the potential energy calculator →

• Momentum Calculator

  p = m v

  p momentum (kg·m/s), m mass, v velocity (a vector: its sign gives the direction)

  Example: A 1.5 kg ball moving at 20 m/s: Momentum p = 30 kg·m/s.

  Open the momentum calculator →

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.