ENGINE INSTALLATION & SERVICE HANDBOOK Caterpillar


Formula for Calculating Horsepower

Usage:



This formula was established by James Watt in the 1800's and requires some known values:

Average horse walks at 21/2 MPH

Average horse pulls with a force of 150 pounds

1 mile = 5,280 feet

With this background, we will be able to establish the Horsepower formulas used today.

5,280 feet × 21/2 MPH = 13,200 FEET per HOUR

220 FT/MIN × 150 POUNDS = 33,000 FT LBS per MINUTE

2π = 6.2831853

Thus we get the familiar formula used today in calculating Hp.


= Radius from centerline of rotating shaft. Usually measured at a distance of one foot out from centerline.

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