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Horsepower Calculation

Note that this calculation does not consider factors such as increasing mechanical friction at higher RPMs, accessories running off of an engine, and other limiting factors. As a result, this calculation will likely overstate horsepower for a given set of variables.

Please enter the missing information below and click the "Calculate" button.

Atmospheric Pressure (lbs / sq.in.):

"Standard" sea level pressure is 14.7 lbs. per sq. in.

Engine Compression Ratio:

Expressed as a single number (e.g. 10 to 1 would be simply "10").

Engine Volumetric Efficiency:

Use 0.85 for street, 0.9 for street / strip, 0.95 for race, & 1 for pro racing.

Engine Displacement (in cubic inches):

Engine RPM:

 
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