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Electrical

Motor Torque from Power Calculator

Convert shaft mechanical power and rotational speed into torque.

Ideal component relationshipsUnits and assumptions explained below
Circuit workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

See the method

Enter circuit values

Runs on your device

Your circuit result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter mechanical shaft power, shaft speed.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Torque = mechanical power / angular speed = 1000P/(2π rpm/60).

A WORKED EXAMPLE

Using mechanical shaft power = 5 kW, shaft speed = 1500 rpm, the result is 31.8309886 N·m. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Enter mechanical output power, not electrical input power, unless efficiency has already been accounted for.

What to keep in mind

Enter mechanical output power, not electrical input power, unless efficiency has already been accounted for. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

How do I use this motor torque from power calculator?

Convert shaft mechanical power and rotational speed into torque. Enter mechanical shaft power in kW, shaft speed in rpm. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Enter mechanical output power, not electrical input power, unless efficiency has already been accounted for.

Methodology maintained by ClarityKit. How these tools are built and checked.