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Watts to Horsepower Converter

Convert watts to mechanical, metric, electric and boiler horsepower, and back.

What this tool does

Convert watts to mechanical, metric, electric and boiler horsepower, and back. Type an amount in watts, choose the units, and the tool converts it to horsepower (mechanical, 550 ft·lbf/s). It offers 6 power units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Watt, Kilowatt, Horsepower (mechanical, 550 ft·lbf/s), Horsepower (metric, PS), Horsepower (electric, 746 W), Horsepower (boiler). Starts as Watt.
  • To: Choose one of the same 6 units as "From". Starts as Horsepower (mechanical, 550 ft·lbf/s).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from watts to horsepower (mechanical, 550 ft·lbf/s):

  • 1 W ≈ 0.00134102 hp
  • 5 W ≈ 0.00670511 hp
  • 10 W ≈ 0.0134102 hp
  • 50 W ≈ 0.0670511 hp
  • 100 W ≈ 0.134102 hp

Multiply the number of watts by about 0.00134102 to get horsepower (mechanical, 550 ft·lbf/s). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Watt: SI Brochure, 9th edition (2019). Horsepower (mechanical, 550 ft·lbf/s): exact by definition.

Limitations

  • Converts units of power only. It does not work out engine output from torque and speed, or motor load from amps and volts.
  • Each horsepower definition is listed separately. Pick the one your source uses.

FAQs

Q: How many horsepower is one watt?
A: One watt is about 0.001341 mechanical horsepower. For metric horsepower it is about 0.001360.
Q: How do I convert horsepower to watts?
A: Choose a horsepower type in the From box and watt in the To box. One mechanical horsepower is about 745.7 W.
Q: Which horsepower does the page start with?
A: Mechanical horsepower. Horsepower comes in several definitions. Mechanical horsepower (hp) is 550 foot-pounds-force per second and is the usual one in the US and UK, metric horsepower (PS) is 75 kilogram-force meters per second and is common in Europe and Asia, and electric horsepower is exactly 746 W. Boiler horsepower (9,809.5 W) is also listed.

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