Power Converter Calculator

Power units span from tiny milliwatts to gigawatts. Convert for engineering, automotive and energy calculations.

What this calculator does

1 horsepower = 745.7 watts = 0.7457 kW = 2,545 BTU/hr

Frequently asked questions

How many watts are in one horsepower?

1 mechanical horsepower = 745.7 watts. 1 kW = 1.341 HP.