When calculating a car's power, understanding the difference between Horsepower (HP) and Wheel Horsepower (WHP) is essential. HP represents the engine’s power at the crankshaft, while WHP is the actual power delivered to the wheels, factoring in drivetrain losses. This calculator helps you convert between HP and WHP based on the drivetrain loss percentage.
How to Use?
Select the conversion type (HP to WHP or WHP to HP), input the power value and drivetrain loss percentage, and press 'Calculate' to get the result. The conversion formulas are provided below for reference.
Conversion Formulas
HP to WHP Formula:
To convert HP to WHP, use the following formula:
WHP = HP × (1 - Drivetrain Loss %)
For example, to convert 400 HP with a drivetrain loss of 15%, the WHP would be:
WHP = 400 × (1 - 0.15) = 340 WHP
WHP to HP Formula:
To convert WHP to HP, use the formula:
HP = WHP / (1 - Drivetrain Loss %)
For example, to convert 340 WHP with a drivetrain loss of 15%, the HP would be:
HP = 340 / (1 - 0.15) = 400 HP
HP to WHP Conversion Table
| Horsepower (HP) | Drivetrain Loss (%) | Wheel Horsepower (WHP) |
|---|---|---|
| 300 HP | 10% | 270 WHP |
| 400 HP | 15% | 340 WHP |
| 500 HP | 20% | 400 WHP |
| 600 HP | 25% | 450 WHP |
Example Calculations
- 300 HP with 10% drivetrain loss: 270 WHP
- 400 HP with 15% drivetrain loss: 340 WHP
- 340 WHP with 15% drivetrain loss: 400 HP
FAQs
1. What is Wheel Horsepower (WHP)?
WHP is the actual power delivered to the wheels, accounting for losses in the drivetrain. It is typically lower than engine HP due to these losses.
2. What is Drivetrain Loss?
Drivetrain loss is the reduction in power that occurs between the engine and the wheels due to components like the transmission, differential, and other mechanical parts. It is typically expressed as a percentage of the engine’s horsepower.