Power Calculator (Work and Force × Speed)
Works out how fast work is being done.
Power
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Kilowatts — kW
Mechanical horsepower — hp
The formula
P = W ÷ t P = F × v
One watt is one joule per second. For rotating shafts, use power from torque and rpm instead.
What to watch out for
For electrical power, use the Ohm’s law calculator. For an engine’s torque and rpm, use the horsepower and torque calculator.
Frequently Asked Questions
What power do you produce climbing stairs?
A 70 kg person rising 3 m in 5 s produces about 412 W, or 0.55 hp.
How many watts are in a horsepower?
745.7 W for mechanical horsepower.