WHP to HP Calculator

WHP to HP Calculator

The calculator will convert wheel horsepower (WHP) to engine horsepower (EHP) and vice versa, based on the drivetrain loss percentage, and show detailed calculations.

WHP to HP

HP to WHP

Wheel horsepower (WHP):

Drive Train (DL):

WHP to HP Calculator

Our WHP to HP calculator helps you determine the engine horsepower equivalent to wheel horsepower (WHP). You can also perform reverse conversions from HP to WHP quickly and accurately.

WHP vs HP

HP refers to the actual power produced by a vehicle’s engine, while WHP (Wheel Horsepower) is the power delivered to the wheels when the vehicle is moving. The difference arises due to drivetrain losses.

Drivetrain losses typically reduce power by 20%–45%.

Conversion Formulas

WHP to HP:

HP = WHP / (1 – DL)

DL = Drivetrain loss (as a decimal, e.g., 0.15 for 15%)

HP to WHP:

WHP = HP × (1 – DL)

DL = Drivetrain loss factor

Example Calculation

Suppose a car has a wheel horsepower (WHP) of 240 and drivetrain loss of 15%. What is the engine horsepower (HP)?

Solution:

HP = WHP / (1 – DL)

HP = 240 / (1 – 0.15)

HP = 240 / 0.85

HP ≈ 282.35

This means the engine produces approximately 282.35 HP to achieve 240 WHP at the wheels.

Drivetrain Loss Chart

Front Wheel Drive	10% (0.10)
Rear Wheel Drive	15% (0.15)
All Wheel Drive / 4WD	25% (0.25)

How the WHP to HP Calculator Works

Our calculator converts between wheel horsepower (WHP) and engine horsepower (HP) accurately and easily. The interface is simple and intuitive:

Inputs:

Select conversion type (WHP → HP or HP → WHP)
Enter the corresponding value (WHP or HP)
Click “Calculate”

Outputs:

Converted engine horsepower (HP) from WHP
Converted wheel horsepower (WHP) from HP

References

From Wikipedia: WHP, Horsepower, Measurement, Engine power test standards.