Power Converter
Convert between watts, kilowatts, horsepower and BTU/h.
Enter values
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Step by step
The formula
result = value × (factorₓ / factorᵧ)
Power is energy per unit of time — a watt is one joule per second. Horsepower dates to comparing steam engines against draught horses; mechanical horsepower is about 745.7 watts, and metric PS is slightly different at 735.5.
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Example calculations
Common questions this calculator answers — select one to load its values.
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Frequently asked questions
How many watts in one horsepower?+
One mechanical horsepower equals about 745.7 watts.
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