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Horsepower to Watts Converter

Convert horsepower to watts and watts to horsepower, for mechanical, metric and electric horsepower.

What this tool does

Convert horsepower to watts and watts to horsepower, for mechanical, metric and electric horsepower. Type an amount in horsepower (mechanical, 550 ft·lbf/s), choose the units, and the tool converts it to watts. It offers 7 power units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Horsepower (mechanical, 550 ft·lbf/s), Horsepower (metric, PS), Horsepower (electric, 746 W), Watt, Kilowatt, Megawatt, BTU (International Table) per hour. Starts as Horsepower (mechanical, 550 ft·lbf/s).
  • To: Choose one of the same 7 units as "From". Starts as Watt.

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

  • 1 hp ≈ 745.699872 W
  • 5 hp ≈ 3,728.499358 W
  • 10 hp ≈ 7,456.998716 W
  • 50 hp ≈ 37,284.993579 W
  • 100 hp ≈ 74,569.987158 W

Multiply the number of horsepower (mechanical, 550 ft·lbf/s) by about 745.699872 to get watts. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

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

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 watts is one horsepower?
A: One mechanical horsepower is about 745.7 W, one metric horsepower (PS) is 735.49875 W and one electric horsepower is exactly 746 W.
Q: How do I convert watts to horsepower?
A: Choose watt in the From box and a horsepower type in the To box. One watt is about 0.001341 mechanical horsepower.
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.

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