Shaft Torque from Power and RPM Calculator
Shaft Torque from Power and RPM is intended for the specific mechanics task described by its name. Enter mechanical power w, rotation speed rpm to calculate a result expressed in N m. The formula works entirely in your browser and needs no account or external API. Assumes steady mechanical power at stated shaft speed. This estimate is useful for comparing scenarios when the supplied measurements follow the stated assumptions.
How to use this calculator
- Measure mechanical power w in the units indicated on the input label.
- Enter Rotation speed rpm.
- Read the N m result, then compare alternative inputs to evaluate your own situation.
Shaft Torque from Power and RPM formula
60*watts/(2*Math.PI*rpm) (N m).
- The expression 60*watts/(2*Math.PI*rpm) combines Mechanical power W, Rotation speed rpm. Follow the units on each input: the answer is expressed in N m.
- Assumes steady mechanical power at stated shaft speed.
Worked examples
Worked example: Shaft Torque from Power and RPM
Use these sample measurements: Mechanical power W = 1500, Rotation speed rpm = 1500.
Compute 60*watts/(2*Math.PI*rpm).
Using the example inputs, the result is 9.549297 N m. Use this value to verify the formula before changing the measurements.
Understanding the result
Interpret the output as N m; it is not a measurement taken directly from a physical system.
Assumes steady mechanical power at stated shaft speed.
Important notes
Assumes steady mechanical power at stated shaft speed.
Review the input units, any required legal or engineering rules, and unusual edge cases before acting on this estimate.
Frequently asked questions
What does Shaft Torque from Power and RPM calculate?
It evaluates 60*watts/(2*Math.PI*rpm) to produce N m from the measurements you enter. For the example values shown, the result is 9.549297 N m.
Which assumptions matter most?
Assumes steady mechanical power at stated shaft speed.
Can I compare two scenarios?
Yes. Enter another set of measurements in the same units and compare the two outputs.
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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.