Wheel Horsepower Calculator

Your details

Choose the direction of conversion, or calculate HP from torque and RPM.
Switch between HP and kW. All inputs and outputs update together.
The rated output at the engine crankshaft (from the manufacturer spec or engine dyno).
HP
Each layout has a typical drivetrain loss. Choose "Custom loss %" to enter your own.
Wheel horsepower (WHP)Typical drivetrain loss
255

Power delivered to the wheels after drivetrain losses

Crank horsepower300
Power lost to drivetrain45
Drivetrain loss applied15%
WHP in kW190.2kW
Crank HP in kW223.7kW
15% %
Very low<12%Typical12%-17%Moderate17%-22%High22%+
Wheel HP255
Drivetrain Loss45

255.0 HP at the wheels from 300.0 HP at the crank.

  • Your drivetrain consumes about 45.0 HP (15.0%), leaving 255.0 HP at the wheels from 300.0 HP at the crank.
  • Rear-wheel drive losses come mainly from the gearbox, driveshaft, and rear differential. High-quality synthetic lubricants can trim these losses slightly.
  • Chassis dyno results vary by operator, correction factor (SAE J1349 or EU 80/1269), tyre pressure and ambient conditions, so treat WHP as an estimate within about 5% on a given day.

Next stepFor the most accurate WHP figure, use a chassis dyno with SAE J1349 correction applied and at least two consecutive runs to confirm repeatability.

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