Classical Mechanics
Work & Power Calculator
Calculate work done (W = Fd·cosθ) and power output (P = W/t). Supports joules, kilowatt-hours, watts, horsepower and more.
W = F · d · cosθ
0° = force parallel to motion (maximum work). 90° = no work done.
Enter force, distance (and time for power) to calculate.
Work and Power
Work is done when a force causes displacement in the direction of the force: W = Fd·cosθ. No work is done if the force is perpendicular to displacement (θ = 90°) — this is why a book resting on a table does no work on the table despite exerting a force on it. Power is the rate of doing work: P = W/t.