Enter your Engine Horsepower (BHP), Drivetrain Type, and Transmission Type into the Wheel Horsepower Calculator to find your Wheel Horsepower (WHP) — the power actually reaching your wheels — along with your Total Power Loss, Loss Percentage, and Drivetrain Loss eating into that number.
Wheel Horsepower (WHP)
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Total Power Loss
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Loss Percentage
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Drivetrain Loss
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Engine horsepower (BHP) is the power produced by the engine at the crankshaft, while wheel horsepower (WHP) is the actual power delivered to the wheels after accounting for drivetrain losses through the transmission, differential, and other components.
Typical drivetrain losses are 12-15% for FWD vehicles, 15-18% for RWD vehicles, and 18-25% for AWD vehicles. Manual transmissions generally have lower losses than automatic transmissions.
AWD vehicles have higher losses because power must be transmitted through additional components like transfer cases, multiple differentials, and more driveshafts, creating more friction and parasitic losses.
These are estimates based on typical drivetrain losses. Actual losses can vary based on vehicle age, maintenance condition, modifications, lubricant quality, and specific drivetrain design.
Wheel horsepower gives a more accurate representation of actual performance since it shows the power actually delivered to the road. However, engine HP is more commonly advertised by manufacturers.
You can minimize losses by using high-quality synthetic lubricants, ensuring proper maintenance, reducing rotating mass with lighter wheels, and keeping drivetrain components in good condition.
Key factors include transmission type, drivetrain layout, component quality, lubricant type, operating temperature, component wear, and overall maintenance condition of the drivetrain system.