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Performance Vehicle Calculators

Wheel Horsepower Calculator

Convert between crank and wheel horsepower using the drivetrain loss for your layout.

Enter values

Results update as you type.

Result

Wheel horsepower

255 hp

Crank power
300 hp
Wheel power
255 hp
Power lost in the drivetrain
45 hp
In kilowatts at the wheels
190.15
Drivetrain loss
15%

About the Wheel Horsepower Calculator

Convert between crank and wheel horsepower using the drivetrain loss for your layout.

Also known as: whp to bhp, drivetrain loss calculator, crank to wheel hp, dyno horsepower.

How to use this calculator

  1. Enter convert, power, drivetrain.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

wheel hp = crank hp × (1 − drivetrain loss)

Worked example

Using the values pre-filled in the calculator above:

  • Convert: Crank → wheel
  • Power = 300 hp
  • Drivetrain: Rear-wheel drive manual (15%)

the calculator returns:

  • Wheel horsepower: 255 hp
  • Crank power: 300 hp
  • Wheel power: 255 hp
  • Power lost in the drivetrain: 45 hp