⌘K

Wheel Horsepower Calculator

Calculate Wheel Horsepower (WHP) from Brake Horsepower (BHP) and vice versa.

Drivetrain Type & Loss

Loss:%

0% (No Loss)25%50% (High Loss)

Engine Horsepower (BHP)

FWD (Front Wheel Drive)

Most efficient. Typically loses 10-15% power due to fewer drivetrain components.

RWD (Rear Wheel Drive)

Moderate loss. Typically loses 15-20% power due to the driveshaft and rear differential.

AWD (All Wheel Drive)

Highest loss. Typically loses 20-25% power due to transfer case and multiple differentials.

Features

BHP to WHP

Calculate wheel horsepower from engine horsepower.

WHP to BHP

Estimate engine horsepower from wheel horsepower.

Drivetrain Loss

Adjustable drivetrain loss for FWD, RWD, and AWD.

About Wheel Horsepower Calculator

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.

How to Use Wheel Horsepower Calculator

1
Select Drivetrain
Choose your vehicle's drivetrain type (FWD, RWD, AWD) or enter a custom loss percentage.
2
Enter Power
Input your known Engine HP (BHP) or Wheel HP (WHP).
3
View Result
The calculator instantly estimates the converted value.

Frequently Asked Questions

Brake Horsepower (BHP) is the power produced by the engine, while Wheel Horsepower (WHP) is the actual power that reaches the ground after drivetrain loss.

Drivetrain loss typically ranges from 10% to 25%. FWD cars lose about 15%, RWD 18%, and AWD cars around 22% due to more moving parts.

Yes, BHP generally refers to the horsepower measured at the engine's crankshaft without the power loss caused by the transmission and axles.

WHP is what actually moves your car. It's the number you'll see on a chassis dynamometer (dyno) and is a better indicator of real-world performance.

Weight doesn't change the horsepower itself, but it drastically affects how that horsepower translates into acceleration and speed (power-to-weight ratio).

Yes, modifications like lighter flywheels, carbon fiber driveshafts, or higher-efficiency bearings can reduce internal friction and decrease power loss.