Work out watt to horsepower instantly with clear inputs, formula shown and shareable results.
Converting Watts to Horsepower is one multiplication: a single W is 0.00134102 hp, so the amount is scaled by that factor. Reversing the direction divides by the same factor. The factor is an exact definition rather than a rounded figure, so the result stays precise at any magnitude. Mechanical horsepower is 550 ft·lbf/s = 745.6998716 W. Metric horsepower (PS), used in much of Europe, is 735.49875 W — about 1.4% smaller.
Watts → Horsepower
hp = W × 0.00134102
Horsepower → Watts
W = hp ÷ 0.00134102
One W equals 0.00134102 hp. That value is exact by definition.
Divide by 0.00134102 rather than multiplying, or flip the direction selector which does it for you.