Generic motor estimate

Motor Output, Input Power & Current Calculator

Estimate electrical input power, apparent power and current from motor shaft output, efficiency, power factor, voltage and phase.

Enter your values

Example values demonstrate the method; they are not product recommendations.

Your result

Enter measured or nameplate values to calculate.

Method

Mechanical output is converted to kW, divided by efficiency for electrical input, then divided by power factor for kVA and converted to current.

Important limits

Nameplate or measured values are better than defaults. Starting current, harmonics, duty, temperature and protection are outside this estimate.

Technical reference

Estimate motor input power and running current from output power, efficiency, power factor, voltage and phase.

What to enter

Use current, project-specific values for motor output power, efficiency, power factor, voltage and phase. Check every unit before calculating and compare like-for-like inputs. The template controls the actual fields and calculations; this supporting copy does not replace its labels, formulas or result logic.

How to use the result

Treat input power and running current as estimates. Starting current, duty, temperature, nameplate limits and installation conditions require separate checks.

Before making a decision

Verify source measurements, equipment specifications and operating conditions. Have a qualified professional review the final selection, safety and installation requirements before purchase, connection or construction.