Motor Torque From Shaft Power
Use this motor torque from shaft power tool when you have measured values for power kw, rpm. It applies a transparent mathematical relationship to those values to return an answer in N·m. Unlike a prediction or recommendation, this is a calculation from your inputs. Ideal mechanical shaft output without drivetrain losses. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for power kw, rpm.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported N·m quantity against your own data and the limitations below.
Formula for Motor Torque From Shaft Power
N·m = power_kw*1000*60/(2*π*rpm). Inputs are expressed in the units shown by the labels.
- This uses a direct mechanics relationship and does not retrieve remote data, forecasts or individual account information.
- Ideal mechanical shaft output without drivetrain losses.
Worked examples
Worked example — Motor Torque From Shaft Power
Enter Power kw = 2.4, Rpm = 960.
Apply power_kw*1000*60/(2*π*rpm).
Calculated value: approximately 23.87324 N·m.
Understanding the result
The example produces about 23.87324 N·m; this is a mathematical output for the example inputs, not an observed result for your project.
Ideal mechanical shaft output without drivetrain losses.
Important notes
Ideal mechanical shaft output without drivetrain losses.
Use values from the same measurement period or physical system. The result is in N·m and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does Motor Torque From Shaft Power calculate?
It converts power kw, rpm into a quantity measured in N·m using the stated formula.
Which assumption matters most?
Ideal mechanical shaft output without drivetrain losses.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.