Torque to Power Converter – Convert Engine Torque & RPM to HP or kW

Calculate your engine's power output from torque and RPM with our Torque-to-Power Converter. Enter torque in Nm or lb-ft along with RPM to get horsepower or kilowatts instantly — perfect for automotive enthusiasts and engineers.

Torque

Engine Speed (RPM)

Output Unit

Power Calculation Result

Enter values and click Calculate to see results

Understanding Torque and Power

Torque is the rotational force an engine produces, while power (HP or kW) is the rate at which work is done. They're related through engine speed (RPM):

kW = (Torque (Nm) × RPM) / 9549.3

HP = (Torque (Nm) × RPM) / 7127

HP = (Torque (lb-ft) × RPM) / 5252

Key insight: At 5252 RPM, torque (lb-ft) and horsepower are always equal. This is why dyno charts always cross at this point.

How to Convert Torque to Power

Enter Torque Value

Input your engine's torque measurement in Newton-meters (Nm) or pound-feet (lb-ft).

Add Engine RPM

Enter the engine speed at which you want to calculate power output.

Get Power Output

Instantly receive horsepower (HP) or kilowatts (kW) with the formula used.

Why Use This Torque to Power Converter

Dual Unit Support

Convert between metric (Nm, kW) and imperial (lb-ft, HP) units seamlessly for international compatibility.

Accurate Formulas

Uses industry-standard equations: kW = (Nm × RPM) / 9549.3 and HP = (lb-ft × RPM) / 5252.

Dyno Chart Insight

Understand why torque and horsepower curves intersect at 5252 RPM on dynamometer graphs.

Engine Tuning Reference

Perfect for tuners, mechanics, and enthusiasts analyzing engine performance modifications.

Power Conversion Formulas

From	To	Formula
Nm + RPM	kW	kW = (Nm × RPM) / 9549.3
Nm + RPM	HP	HP = (Nm × RPM) / 7127
lb-ft + RPM	HP	HP = (lb-ft × RPM) / 5252

Frequently Asked Questions

What is the formula to convert torque to horsepower?

Horsepower = (Torque × RPM) / 5252 when using lb-ft. For Nm, use HP = (Nm × RPM) / 7127. This formula comes from the definition of horsepower as 550 foot-pounds per second.

Why do torque and horsepower cross at 5252 RPM?

The number 5252 comes from the conversion factor between lb-ft/min and horsepower. At exactly 5252 RPM, the numerical values of torque (lb-ft) and horsepower are always equal, which is why dyno charts intersect at this point.

How do I convert Nm to lb-ft?

Multiply Nm by 0.7376 to get lb-ft. For example, 400 Nm × 0.7376 = 295 lb-ft. Conversely, divide lb-ft by 0.7376 (or multiply by 1.356) to get Nm.

What's more important: torque or horsepower?

Torque determines low-end pulling power and acceleration from a stop. Horsepower determines top speed and high-RPM performance. Both matter—torque gets you moving, horsepower keeps you accelerating.

How accurate is this torque to power calculation?

This calculation provides theoretical power at the crank. Actual wheel horsepower will be 10-20% lower due to drivetrain losses. For precise measurements, use a chassis dynamometer.

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