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Calculate Wheel Horsepower (WHP) from Brake Horsepower (BHP) and vice versa.
Calculate wheel horsepower from engine horsepower.
Estimate engine horsepower from wheel horsepower.
Adjustable drivetrain loss for FWD, RWD, and AWD.
The Wheel Horsepower Calculator helps you estimate the power your car puts down to the wheels (WHP) based on its engine power (BHP), or work backwards to find engine power from a dyno result. It accounts for drivetrain loss, which varies between Front Wheel Drive (FWD), Rear Wheel Drive (RWD), and All Wheel Drive (AWD) vehicles.
Choose your vehicle's drivetrain type (FWD, RWD, AWD) or enter a custom loss percentage.
Input your known Engine HP (BHP) or Wheel HP (WHP).
The calculator instantly estimates the converted value.
Most efficient. Typically loses 10-15% power due to fewer drivetrain components.
Moderate loss. Typically loses 15-20% power due to the driveshaft and rear differential.
Highest loss. Typically loses 20-25% power due to transfer case and multiple differentials.