Brake Horsepower Calculator
Calculate brake horsepower from torque and RPM, or convert between BHP, kW and PS for engine specs, free right in your browser.
Enter Values
Minimum 0
Minimum 0
How to use this calculator
- Enter the torque (N·m) and engine speed (rpm).
- Read the power in kW and hp.
How it works
Power (kW) = torque × rpm ÷ 9549; multiply by 1.341 for horsepower.
Worked example
200 N·m at 3000 rpm. ≈ 62.8 kW (84.3 hp).
Common mistakes
- Mixing pound-feet with newton-metres — convert first.
- Reading peak torque and peak power at the same rpm (they rarely coincide).
Frequently asked questions
How is brake horsepower calculated?
From torque and engine speed: bhp = torque (lb-ft) × rpm ÷ 5252. The tool also converts to and from kilowatts.
What is the difference between bhp and kW?
They measure the same power in different units — 1 kW is about 1.34 hp. ‘Brake’ refers to measuring at the crank with a brake dynamometer.
Is this crank or wheel power?
It reflects whatever torque you enter — quote crank torque for crank power, wheel torque for wheel power.
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Cite this tool
Zerdly. (2026). Brake Horsepower Calculator. Retrieved from https://www.zerdly.com/tools/brake-horsepower-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.