Convert power and torque units, or solve mechanical shaft torque, power or speed from the other two quantities. Converting kW to N·m requires shaft speed; electrical input power also requires a known efficiency to determine mechanical output.
| kW to Nm | Nm to kW |
|---|---|
| 0.37 kW ≈ 2.36 Nm | 5 Nm ≈ 0.785 kW |
| 0.75 kW ≈ 4.77 Nm | 10 Nm ≈ 1.571 kW |
| 1.1 kW ≈ 7.00 Nm | 15 Nm ≈ 2.356 kW |
| 1.5 kW ≈ 9.55 Nm | 20 Nm ≈ 3.142 kW |
| 2.2 kW ≈ 14.01 Nm | 25 Nm ≈ 3.927 kW |
| 3 kW ≈ 19.10 Nm | 30 Nm ≈ 4.712 kW |
| 4 kW ≈ 25.46 Nm | 40 Nm ≈ 6.283 kW |
| 5.5 kW ≈ 35.01 Nm | 50 Nm ≈ 7.854 kW |
| 7.5 kW ≈ 47.75 Nm | 75 Nm ≈ 11.781 kW |
| 11 kW ≈ 70.03 Nm | 100 Nm ≈ 15.708 kW |
| Formulas (SI): T(Nm) = C × P(kW) ÷ RPM and P(kW) = T(Nm) × RPM ÷ C, where C = 60,000/(2π) ≈ 9,549.296586. Table values are rounded and assume RPM = 1500. | |
| kW to Nm | Nm to kW |
|---|---|
| 0.25 kW ≈ 0.80 Nm | 2 Nm ≈ 0.628 kW |
| 0.5 kW ≈ 1.59 Nm | 5 Nm ≈ 1.571 kW |
| 1 kW ≈ 3.18 Nm | 10 Nm ≈ 3.142 kW |
| 2 kW ≈ 6.37 Nm | 12 Nm ≈ 3.770 kW |
| 3 kW ≈ 9.55 Nm | 15 Nm ≈ 4.712 kW |
| 5 kW ≈ 15.92 Nm | 20 Nm ≈ 6.283 kW |
| 7.5 kW ≈ 23.87 Nm | 25 Nm ≈ 7.854 kW |
| 10 kW ≈ 31.83 Nm | 30 Nm ≈ 9.425 kW |
| 15 kW ≈ 47.75 Nm | 40 Nm ≈ 12.566 kW |
| 20 kW ≈ 63.66 Nm | 60 Nm ≈ 18.850 kW |
| Formulas (SI): T(Nm) = C × P(kW) ÷ RPM and P(kW) = T(Nm) × RPM ÷ C, where C = 60,000/(2π) ≈ 9,549.296586. Table values are rounded and assume RPM = 3000. | |
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kW to Nm Formula
The following relationship converts mechanical shaft power in kilowatts to torque in newton-meters at a known nonzero shaft speed.
Variables:
- T is the torque in newton-meters (Nm)
- P is the mechanical power at the same shaft in kilowatts (kW)
- RPM is the rotational speed in revolutions per minute
To convert kW to Nm, multiply the power in kilowatts by 1000, then divide by the product of 2 times pi and the RPM divided by 60.
What is Torque?
Torque is a measure of the force that can cause an object to rotate about an axis. It is a vector quantity, meaning it has both magnitude and direction. Torque is commonly measured in newton-meters (Nm) in the metric system. In the context of engines and motors, torque measures the rotational force produced by the engine’s crankshaft or motor’s rotor.
How to Calculate Torque from kW?
The following steps outline how to calculate the torque from power in kilowatts.
- First, determine the power (P) in kilowatts.
- Next, determine the RPM (rotational speed in revolutions per minute).
- Use the formula T = (P * 1000) / (2 * π * RPM / 60).
- Finally, calculate the torque (T) in newton-meters.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Power (P) = 75 kilowatts
RPM = 1500 revolutions per minute
