How to use the Engine Horsepower Calculator
The engine horsepower calculator converts torque and engine speed to horsepower.
Open the Engine Horsepower Calculator →
What you need to enter
- Torque (lb-ft)
- RPM
The formula
hp = torque (lb-ft) × rpm ÷ 5252.
Worked example
Using the default values in the calculator:
- Torque (lb-ft): 300
- RPM: 5500
| Horsepower | 314.2 hp |
| Kilowatts | 234.3 kW |
| Metric horsepower (PS) | 318.5 |
Tips for better results
- Horsepower and torque are equal at 5,252 rpm.
- 1 hp = 0.7457 kW.
Common mistakes to avoid
- Mixing N·m and lb-ft.
- Using peak values at different rpm.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.