Horsepower Equations Calculator

Automobile Car Truck Design Formulas

Solving for engine horsepower using the trap speed method.
engine horsepower using the trap speed method
This method uses the speed or velocity at the end of a quarter mile run. It is used to give an estimate of vehicle(car, truck, motorcycle) engine horsepower. Weight should include the mass of the vehicle, driver and passenger.


vehicle weight
speed or velocity


weight = 0    = 0  pound
velocity = 0    = 0  mile/hour


horsepower (hp)


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rotating horsepower
Rotating horsepowerRotating horsepower
SpeedSpeed - revolutions per minute (rpm)
estimate engine or motor horse power for cars, trucks and motorcycles
trap speed methodEstimate of engine horsepower after a quarter mile run using the trap speed method.
increase in engine horsepowerDetermine the increase in engine horsepower when an after market modification, race or performance part has been installed with trap speed.
ET methodCalculate engine horsepower after a quarter mile run using the ET method.
estimated increase in engine horsepowerCompute estimated increase in engine horsepower when an after market, racing upgrade or performance part has been installed with ET.
Dyno correction factorDyno correction factor. Factor corrects horsepower for normally aspirated internal combustion engine to a standard humidity, pressure and temperature after dynamometer measurement.
vehicles power to weight ratioCalculate a vehicles power to weight ratio. Acceleration is related to the ratio.

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