Power, Torque & Speed
Torque from Power and RPM Calculator
Enter mechanical power and shaft speed to calculate ideal shaft torque with metric and imperial output units.
Inputs
Formula
Power-speed-torque relationship
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
- Mechanical power
- 7.5 kW
- Shaft speed
- 1,450 rpm
Result
- Shaft torque
- 49.39 N*m
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Technical references for this calculation
Frequently asked questions
Is this motor starting torque?
No. It calculates torque corresponding to the entered mechanical power at the entered running speed.
Does it include drivetrain losses?
No. Apply efficiency separately when power is measured at a different point in the drivetrain.