This **hp to whp calculator** use **WHP = Engine HP × (1 – (Drivetrain Loss / 100))** formula to measure the **actual power output** delivered to the wheels of a vehicle.

**Engine horsepower (HP)** represents the raw power generated by the engine, **wheel horsepower (WHP)** indicates the **usable power** that reaches the wheels after accounting for various **power losses** through the drivetrain system.

- 220 HP → 184.8 WHP (16% loss)
- 275 HP → 230 WHP (16% loss)
- 325 HP → 273 WHP (16% loss)
- 375 HP → 315 WHP (16% loss)
- 425 HP → 357 WHP (16% loss)
- 475 HP → 399 WHP (16% loss)

## HP to WHP Calculator

Engine HP | Drivetrain Type | Loss Factor | Resulting WHP |
---|---|---|---|

250 | FWD | 15% | 212.5 |

300 | FWD | 15% | 255 |

350 | FWD | 15% | 297.5 |

400 | FWD | 15% | 340 |

450 | FWD | 15% | 382.5 |

500 | FWD | 15% | 425 |

300 | RWD | 17% | 249 |

400 | RWD | 17% | 332 |

500 | RWD | 17% | 415 |

600 | RWD | 17% | 498 |

700 | RWD | 16% | 588 |

800 | RWD | 16% | 672 |

900 | RWD | 16% | 756 |

250 | AWD | 22% | 195 |

300 | AWD | 22% | 234 |

400 | AWD | 22% | 312 |

500 | AWD | 22% | 390 |

600 | AWD | 22% | 468 |

700 | AWD | 22% | 546 |

## HP to WHP Conversion Formula

The formula for **converting HP to WHP** accounts for drivetrain losses using a **drivetrain loss factor**.

**WHP = HP × (1 - Drivetrain Loss Factor)**

Typical drivetrain loss factors:

- Front-Wheel Drive (FWD):
15-20% loss(multiply by 0.85-0.80)- Rear-Wheel Drive (RWD):
15-20% loss(multiply by 0.85-0.80)- All-Wheel Drive (AWD):
20-25% loss(multiply by 0.80-0.75)

Calculating WHP for a **300 HP** RWD vehicle with **15% drivetrain loss**:

**WHP = 300 × (1 - 0.15)
WHP = 300 × 0.85
WHP = 255**

## How to Convert HP to WHP?

To convert **HP** to **WHP**, you need to account for these losses, which vary based on the **drivetrain type**:

### For Manual Transmission:

**Front-wheel drive (FWD)**: Multiply**HP**by**0.85**(15% loss)**Rear-wheel drive (RWD)**: Multiply**HP**by**0.83**(17% loss)**All-wheel drive (AWD)**: Multiply**HP**by**0.80**(20% loss)

### For Automatic Transmission:

**FWD**: Multiply**HP**by**0.83**(17% loss)**RWD**: Multiply**HP**by**0.80**(20% loss)**AWD**: Multiply**HP**by**0.75**(25% loss)

If you have a manual RWD car with **300 HP**: **WHP = 300 × 0.83 = 249 WHP**

Calculation for a **500 HP** AWD vehicle with **22% drivetrain loss**:

**WHP = 500 × (1 - 0.22)
WHP = 500 × 0.78
WHP = 390**

## How Much HP is 320 WHP?

**HP = WHP ÷ (1 - Drivetrain Loss Factor)**

For **320 WHP** with a typical RWD drivetrain loss of **17%**:

**HP = 320 ÷ (1 - 0.17)
HP = 320 ÷ 0.83
HP = 385.54 HP**

## How Much Crank HP is 300 WHP?

For **300 WHP**, assuming an FWD vehicle with an **18% drivetrain loss**:

**Crank HP = 300 ÷ (1 - 0.18)
Crank HP = 300 ÷ 0.82
Crank HP = 365.85 HP**

Crank horsepower (measured at the engine’s crankshaft) to WHP conversion follows the same principle.

## How Much Less is WHP to HP?

Here’s a typical breakdown:

- FWD vehicles:
**15-20% less**WHP than HP - RWD vehicles:
**15-20% less**WHP than HP - AWD vehicles:
**20-25% less**WHP than HP

For example, a **400 HP** AWD vehicle might produce:

```
WHP = 400 × (1 - 0.23)
WHP = 400 × 0.77
WHP = 308 WHP
Difference = 92 HP (**23% loss**)
```

## Sources and References

- Society of Automotive Engineers (SAE): https://www.sae.org/standards/

**Related Conversion Tools** :