# What is Brake Horsepower (BHP)?

Brake horsepower is the unit used for the calculation of an engine's capacity of doing work. ScienceStruck tells you more...

Swapnil Srivastava

Last Updated: Feb 7, 2018

History

The term 'horsepower' was coined by James Watt, for efficient marketing of his improved steam engine. It was used to compare the power of a horse with that of a steam engine. Later, John Smeaton estimated that a horse could produce 22,916-foot-pounds per minute, and John Desaguliers increased that to 27,500-foot-pounds per minute. Foot-pounds is an American unit for work, used to describe torque.

Conversions

As per the conventions, 1 BHP equals to:

- 745.5 watts
- 1.01389 ps
- 33,000 ft lbf/min
- 42.2 BTU/min

Other Units Similar to BHP

There are many other units similar to brake horsepower. Some of them are:

*Metric Horsepower:*It is denoted by the symbol hp(M), and is equal to 75 kgf-m/s or 735.498 watts.*Electrical Horsepower:*It is denoted by the symbol hp(E) and is equivalent to 746 watts.*Boiler Horsepower:*It is denoted by the symbol hp(S) and is approximately equivalent to 33,475 Btu/h or 9809.5 watts.