Calculator
Single-Phase Motor Current Calculator
Change the inputs to match your equipment. Results update automatically.
Formula
I = (kW x 1000) / (V x cos phi x efficiency) Worked example
A 1.5 kW shaft output at 230 V, power factor 0.80 and efficiency 0.85 gives about 9.59 A.
Scope and interpretation
The result estimates running current, not starting current. Use the motor nameplate and manufacturer data for final selection.