Power, Torque & Speed
Power from Torque and RPM Calculator
Enter shaft torque and RPM to calculate mechanical power in watts, kilowatts, and horsepower.
Inputs
Formula
Mechanical shaft power
Worked example
Using the default values shown in the calculator, the same formula gives the following result. This is a quick sanity check for the calculation, not a design recommendation.
Inputs
- Shaft torque
- 50 N*m
- Shaft speed
- 1,450 rpm
Result
- Mechanical power
- 7.592 kW
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Technical references for this calculation
Frequently asked questions
Is mechanical power the same as electrical input power?
Not necessarily. Motor and drivetrain efficiency determine the difference between electrical input and mechanical shaft output.
Can I enter pound-feet?
Yes. Torque inputs are converted internally before power is calculated.