Friday, October 9, 2026
Calculator

Motor HP Calculator

Motor output in kW and HP from electrical readings (single or three phase) or from torque and speed.

V
A
%
N·m
rpm

Result

Step-by-step calculation

    Formula

    Three phase: kW input = √3 × V × I × PF ÷ 1000 Single phase: kW input = V × I × PF ÷ 1000 Shaft kW = kW input × Efficiency; Torque: kW = T (N·m) × rpm ÷ 9550; HP = kW ÷ 0.746

    Worked example

    Calculated with the default values shown in the form.

      Technical notes

      • Select a standard motor rating above the calculated load; 10 to 25% margin is common.
      • Use measured running current for existing machines.

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