Horsepower Equations Calculator

Automobile Car Truck Design Formulas

Solving for the change or increase in engine or motor horsepower performance using the ET method.
change or increase in engine or motor horsepower performance using the ET method
This method uses the elapsed time needed to complete 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. Times will need to be measured before and after performance or after market parts have been installed.


vehicle weight
quarter mile time before modification(ET1)
quarter mile time after modification(ET2)


weight = 0    = 0  pound
time1 = 0    = 0  second
time2 = 0    = 0  second


change in horsepower (hp)

Other Units:

Change Equation
Select to solve for a different unknown
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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