This whp to hp conversion is used to convert Wheel Horsepower to Horsepower, if a car’s engine produces 300 HP, the WHP might be around 255 due to these losses.
Explanation of conversion chart
- 1 WHP with a 15% drivetrain loss results in approximately 1.18 HP.
- 600 WHP with a 15% drivetrain loss results in approximately 705.88 HP.
- 280 WHP with a 15% drivetrain loss results in approximately 329.41 HP.
- 500 WHP with a 20% drivetrain loss results in approximately 625.00 HP.
- 650 WHP with an 18% drivetrain loss results in approximately 792.68 HP.
- 1000 WHP with a 10% drivetrain loss results in approximately 1111.11 HP.
WHP to HP Calculator
- 400 WHP is approximately 470.59 HP
- 350 WHP is approximately 411.76 HP
- 700 WHP is approximately 823.53 HP
| WHP | Drivetrain Loss | Conversion | HP |
|---|---|---|---|
| 1 WHP | 15% | HP = 1 ÷ (1 – 0.15) | 1.18 HP |
| 150 WHP | 15% | HP = 150 ÷ (1 – 0.15) | 176.47 HP |
| 200 WHP | 12% | HP = 200 ÷ (1 – 0.12) | 227.27 HP |
| 250 WHP | 18% | HP = 250 ÷ (1 – 0.18) | 304.88 HP |
| 280 WHP | 15% | HP = 280 ÷ (1 – 0.15) | 329.41 HP |
| 300 WHP | 10% | HP = 300 ÷ (1 – 0.10) | 333.33 HP |
| 500 WHP | 20% | HP = 500 ÷ (1 – 0.20) | 625.00 HP |
| 600 WHP | 15% | HP = 600 ÷ (1 – 0.15) | 705.88 HP |
| 650 WHP | 18% | HP = 650 ÷ (1 – 0.18) | 792.68 HP |
| 1000 WHP | 10% | HP = 1000 ÷ (1 – 0.10) | 1111.11 HP |
WHP to HP Conversion Formula
The formula to convert WHP to HP is:
HP = WHP ÷ (1 - Drivetrain Loss)Where:
- HP is the engine horsepower
- WHP is the measured wheel horsepower
- Drivetrain Loss is expressed as a decimal (e.g., 15% = 0.15)
For instance, if a car has 200 WHP and we assume a 15% drivetrain loss:
HP = 200 ÷ (1 - 0.15) = 200 ÷ 0.85 ≈ 235.29 HPThis calculation estimates that the engine produces about 235 HP to achieve 200 WHP.
How to convert WHP to HP?
To convert WHP to HP:
- Measure the wheel horsepower (WHP) using a dynamometer.
- Estimate the drivetrain loss percentage (typically 10-20% for most vehicles).
- Convert the loss percentage to a decimal (e.g., 15% = 0.15).
- Apply the formula: HP = WHP ÷ (1 – Drivetrain Loss).
For example, with 180 WHP and an estimated 12% drivetrain loss:
HP = 180 ÷ (1 – 0.12) = 180 ÷ 0.88 ≈ 204.55 HP
Is WHP the same as HP?
WHP is not the same as HP. They represent power measurements at different points in a vehicle:
HP (Horsepower) typically refers to the power produced by the engine itself, often measured on an engine dynamometer before installation in the vehicle.
WHP (Wheel Horsepower) is the power measured at the wheels after accounting for drivetrain losses.
WHP is always lower than HP due to power losses in the transmission, differential, and other drivetrain components. The difference can be significant, often 10-20% or more, depending on the vehicle's drivetrain efficiency.How to calculate wheel HP?
To calculate wheel HP (WHP):
- Use a chassis dynamometer to measure the power output at the wheels.
- Ensure the vehicle is properly secured and warmed up.
- Run the vehicle through its gears, typically in the highest gear for the most accurate reading.
- The dynamometer will provide a WHP reading based on the force and speed measured at the wheels.
What is WHP?
WHP (Wheel Horsepower) is a measure of the power output of a vehicle as measured at its wheels. It represents the actual power available to move the vehicle, after accounting for all drivetrain losses.
Key points about WHP:
- It’s lower than engine HP due to power losses in the drivetrain.
- WHP is a more accurate representation of a vehicle’s real-world performance.
- It’s typically measured using a chassis dynamometer.
- WHP is especially useful for comparing vehicles or assessing the impact of modifications.
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