About This Calculator
This WHP to BHP Calculator converts Wheel Horsepower (WHP) to Engine Brake Horsepower (BHP) by applying drivetrain loss percentages. It accounts for typical drivetrain losses of 15%–25% based on configuration (FWD, RWD, AWD).
How It Works
- Enter the Wheel Horsepower (WHP) value.
- Select your drivetrain type: Front-wheel, Rear-wheel, or All-wheel drive.
- The calculator applies the respective drivetrain loss to compute the Brake Horsepower (BHP).
BHP =
WHP1 − Loss Coefficient
Understanding Drivetrain Loss
Drivetrain loss is the power lost between the engine and wheels due to friction, resistance, and component inefficiency. Loss rates vary by drivetrain type.
| Drivetrain Type | Typical Loss |
|---|---|
| Front-wheel drive (FWD) | 15% |
| Rear-wheel drive (RWD) | 20% |
| All-wheel drive (AWD) | 25% |
Frequently Asked Questions
What’s the difference between WHP and BHP?
WHP is measured at the wheels, while BHP is measured at the engine crankshaft. BHP is always higher due to drivetrain losses.
Why does drivetrain type affect the result?
Different drivetrains have different mechanical losses. AWD systems typically lose more power due to added components.
Is this calculator accurate for all vehicles?
It provides a good estimate for stock vehicles. For heavily modified setups, real-world drivetrain losses may differ.