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Horsepower to Watts Calculator

Convert between mechanical horsepower and watts.

Inputs

Saved Scenarios

— select 2+ to compare

Result

74,569.99

Spark says

How it's calculated

Formula

Pwatts=Php×745.7P_{watts} = P_{hp} \times 745.7
745.7
— Watts per mechanical horsepower

What is the Horsepower to Watts Calculator?

This calculator converts between mechanical horsepower (the traditional unit for engine power) and watts (the SI unit of power).

How to use it

  1. 1 Enter the value.
  2. 2 Choose the conversion direction.

Worked examples

100 hp to watts

Equals 74,570 watts (about 74.6 kW).

Try it

Frequently asked questions

Is this the same as electrical or metric horsepower?

No — this uses mechanical (imperial) horsepower (745.7 W). Metric horsepower (PS) and electrical horsepower use slightly different constants.