AutoCalculator.org
Quarter Mile Horsepower Calculator
                           1/4 Mile Horsepower Formula

According to Patrick Hale's formula: to calculate the engine horsepower of a vehicle, enter the 1/4 mile trap speed in mph and the weight in lbs. Hit the Calc Horsepower button to obtain the estimated value.

Car Weight  (lbs)



1/4 mile speed (mph)      



 
 


The Trap Speed method involves the measurement of the speed of a vehicle at the end of a fixed distance run (usually the distance is taken as 1/4 of a mile).

Note: The total weight of the vehicle including the occupants and fuel loading over the trap speed run should be used when estimating the vehicle horsepower.

References:

Power to Weight Ratio calculator.

Engine Displacement Formula calculator.

Auto Math Handbook, J Lawlor, ISBN-13: 978-1557880208.