Nm to Kw Calculator

Convert torque and RPM to shaft power in kW or HP, or calculate missing torque in Nm or lb-ft or RPM from any two entered shaft values.

• Kw to Wh Conversion Calculator

Nm to kW Formula

Use the relationship between torque, speed, and power to convert Newton-meters to kilowatts.

P = \frac{T \times 2 \pi \times RPM}{60 \times 1000} \quad \text{(kW)}

Variables:

• P is power in kilowatts (kW)
• T is torque in Newton-meters (Nm)
• RPM is rotational speed in revolutions per minute

Tip: A handy shortcut is kW ≈ T × RPM / 9550 (because 9550 ≈ 60×1000 / 2π).

How to Calculate kW from Nm

1. Note the torque T in Newton-meters and the speed RPM.
2. Apply kW = (T × 2π × RPM) / (60 × 1000) or the shortcut kW ≈ T × RPM / 9550.
3. Compute power in kilowatts and verify with the calculator above.

Example: With T = 120 Nm at 1500 RPM, power ≈ 120 × 1500 / 9550 = 18.85 kW.