How many horsepower are in a watt?

1 W = 0.001341 hp. To convert any amount, multiply by 0.001341.

How do you convert watts to horsepower?

Multiply the number of watts by 0.001341 to get horsepower. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Power

Watts to horsepower converter

Convert watts (W) to horsepower (hp). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert watts to horsepower— the formula

Watts convert to horsepower by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

hp = W × 0.001341

W = hp × 745.7

Watt: SI derived. 1 hp (mechanical) = 745.6998715822702 W; 1 BTU/hr = 0.29307107 W (NIST SP 811).

Questions

Frequently asked questions

How many horsepower are in a watt?
1 W = 0.001341 hp. To convert any amount, multiply by 0.001341.
How do you convert watts to horsepower?
Multiply the number of watts by 0.001341 to get horsepower. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.