WHP to HP Calculator
Use our WHP to HP Calculator to easily convert Wheel Horsepower (WHP) to Horsepower (HP). Simply enter your Wheel Horsepower (WHP), select your drivetrain type, and get the HP conversion instantly!
Wheel Horsepower (WHP) and Horsepower (HP) are crucial measurements in the automotive and motorcycle industries. WHP represents the actual power delivered to the wheels, whereas HP refers to the power produced by the engine before drivetrain losses.
To obtain an accurate WHP to HP conversion, understanding the drivetrain efficiency is essential.
How to Convert WHP to HP
WHP to HP Formula
The standard formula for converting WHP to HP is:
HP = WHP / Drivetrain Efficiency
Drivetrain efficiency varies depending on the type of vehicle:
- Rear-Wheel Drive (RWD): ~85% efficiency (15% loss)
- Front-Wheel Drive (FWD): ~87% efficiency (13% loss)
- All-Wheel Drive (AWD): ~80% efficiency (20% loss)
Example Calculation:
If a car has 250 WHP and is RWD (85% efficiency): HP = 250 / 0.85 = 294 HP
WHP to HP Conversion Examples
Here are some practical WHP to HP conversion examples:
a) Motorcycle WHP to HP Example:
A motorcycle with 120 WHP and a chain-driven drivetrain (95% efficiency):
HP = 120 / 0.95 = 126 HP
b) Car WHP to HP Example:
A sports car with 400 WHP and 80% efficiency (AWD):
HP = 400 / 0.80 = 500 HP
WHP to HP Conversion Chart
Here is a quick WHP to HP conversion chart based on common drivetrain losses:
| WHP to HP Conversion |
|---|
| 500 whp to hp = 588.24 hp |
| 400 whp to hp = 470.59 hp |
| 700 whp to hp = 823.53 hp |
| 450 whp to hp = 529.41 hp |
| 800 whp to hp = 941.18 hp |
| 300 whp to hp = 352.94 hp |
| 350 whp to hp = 411.76 hp |
| 1200 whp to hp = 1411.76 hp |
| 550 whp to hp = 647.06 hp |
| 750 whp to hp = 882.35 hp |
| 380 whp to hp = 447.06 hp |
| 600 whp to hp = 705.88 hp |
| 1000 whp to hp = 1176.47 hp |
| 430 whp to hp = 505.88 hp |
| 280 whp to hp = 329.41 hp |
| 390 whp to hp = 458.82 hp |
| 650 whp to hp = 764.71 hp |
Formula used:
HP = WHP ÷ 0.85 (Assuming 15% drivetrain loss)
Relationship Between WHP and HP
WHP is always lower than HP due to energy losses in the drivetrain. HP is the power at the crankshaft, while WHP is the usable power after drivetrain losses. This relationship highlights the importance of drivetrain efficiency in vehicle performance.
Why Use Our WHP to HP Calculator?
- Accurate conversion based on drivetrain type
- User-friendly interface
- Saves time compared to manual calculations
FAQs
1. What is the difference between WHP and HP?
Horsepower (HP) refers to the power generated by the engine at the crankshaft, while Wheel Horsepower (WHP) is the power that actually reaches the wheels after drivetrain losses.
2. Why is WHP lower than HP?
Drivetrain components such as the transmission, differential, and axles cause energy losses, resulting in lower WHP compared to HP.
3. How do I accurately measure WHP?
WHP is typically measured using a dynamometer (dyno), which calculates the power output at the wheels.
4. How much HP is lost in different drivetrain types?
- RWD vehicles lose approximately 15% of power.
- FWD vehicles lose around 13% of power.
- AWD vehicles lose about 20% of power due to additional drivetrain components.
5. Can I increase WHP without increasing HP?
Yes, reducing drivetrain losses through lightweight components, better lubrication, or improved transmission efficiency can increase WHP without modifying the engine.
6. Does WHP matter more than HP?
WHP is a more practical measurement because it reflects the actual power delivered to the road, making it crucial for performance evaluations.
7. Is there a simple way to estimate WHP from HP?
Yes, you can estimate WHP by multiplying HP by the drivetrain efficiency percentage: WHP = HP × Drivetrain Efficiency
8. What role does a dyno play in WHP measurement?
A dynamometer (dyno) measures WHP by calculating the force exerted by the wheels while simulating real-world driving conditions.
9. Can I use the WHP to HP formula for motorcycles?
Yes, but motorcycles typically have higher drivetrain efficiency (90-95%), so the losses are lower compared to cars.
10. Why do manufacturers list HP instead of WHP?
Manufacturers list HP because it is a standardized measurement that doesn’t vary based on drivetrain losses, unlike WHP, which depends on the specific vehicle configuration.
