Enter the wheel horsepower and select the drivetrain of the car to determine the HP from WHP.
- Wheel Horsepower Calculator
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- Thrust to Horsepower Calculator
- Drivetrain Loss Calculator
- Wheel Torque Calculator
- Engine KW to Wheel KW Calculator
- Brake Horsepower Per Ton Calculator
- HP to Acceleration Calculator
WHP to HP Formula
The following formula is used to calculate the engine horsepower (hp) from wheel horsepower (WHP).
HP = WHP * 1 / (1 – DL )
- Where HP is the engine horsepower
- WHP is the wheel horsepower
- DL is the drive train loss
The drive train loss is .10 (10%) for front-wheel drive, .15 for rear-wheel drive, and .25 for all-wheel drive.
Why are HP and WHP different?
HP is typically used to refer to the true engine horsepower output, while WHP is used to describe the wheel horsepower, which is the horsepower that makes it to the wheel after drive-train loss is accounted for.
How to conver WHP to HP?
Example Problem:
The following example problem outlines the steps and information needed to calculate HP from WHP.
First, determine the wheel horsepower. In this case, the wheel horsepower is measured to be 250 HP.
Next, determine the type of drive train. In this example, we are looking at a front-wheel-drive system.
Next, determine the drive-train loss of the system from the type of drive-train. In this case, the DTL is .10.
Finally, calculate the HP from WHP and DL using the formula above:
HP = WHP * 1 / (1 – DL )
HP = 250 * 1 / (1 – .10 )
HP = 277.77 horsepower
