Torque to Horsepower Converter

Calculate engine horsepower from torque and RPM using the standard mechanical formula $HP = (Torque_{lb-ft} \times RPM) / 5252$. Enter torque in lb-ft, N·m, or kg·m, set engine speed, and get horsepower, metric PS, and kilowatts instantly. For general torque unit conversion, use our Torque Converter.

Understanding the formula

Horsepower measures how quickly work is done. When torque is expressed in pound-feet and speed in revolutions per minute, the constant 5252 comes from unit conversion between angular velocity and linear power in the imperial system.

Automotive applications

Compare engine output at different RPM points.
Estimate power from dyno torque curves.
Convert metric torque specs to imperial horsepower.

Frequently Asked Questions

What units of torque are supported?

Pound-feet (lb-ft), newton-meters (N·m), and kilogram-meters (kg·m).

Why divide by 5252?

5252 is the RPM value where horsepower and torque numerically match when torque is in lb-ft.

What is metric horsepower (PS)?

PS is a metric horsepower unit. This tool shows an approximate PS value alongside HP and kW.

Can torque be zero RPM?

Yes. At 0 RPM, calculated horsepower is 0 regardless of torque.

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Torque to Horsepower Converter