Engine HP Horsepower Change Calculator - ET Method
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Horsepower change calculator that allows you to calculate the estimated change in the engine hp after a performance part has been installed with ET.

Engine Horsepower (HP) Change Calculation

Horsepower change calculator that allows you to calculate the estimated change in the engine hp after a performance part has been installed with ET.

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Formula Used: Horsepower_change = Weight / ( ET₂ / 5.825 )³ - Weight / ( ET₁ / 5.825 )³

Calculation of engine horsepower change using ET method is made easier here.

Vehicle weight	=
Mile time before modification(ET1)	=
Mile time after modification(ET2)	=



Horsepower_change	=