Electrical EngineeringP0

Motor Power Calculator

Calculate electric motor shaft power from electrical power input and motor efficiency, or convert between kW and HP.

Inputs

Enter your values below

Input Power*kW

Motor Efficiency*

Enter as decimal (0.9 = 90%)

Result

Shaft Power Output

—

Enter values and click Calculate

Formula

power_input × efficiency ÷ 1000

Result unit: kW

Shaft power output P_out = P_in × η. P_in converted from kW to W by engine; /1000 returns result in kW. η is efficiency as decimal (0-1).

Introduction

Calculate the actual mechanical shaft power delivered by an electric motor given its electrical input power and efficiency. Essential for motor sizing and pump/fan drive calculations.

Calculation Example

A 22 kW motor operating at 90% efficiency delivers 19.8 kW of shaft power.

Inputs: power_input=22, efficiency=0.9

Result: 19.8 kW

Engineering Applications

•Motor sizing
•Pump drive selection
•Energy consumption estimation
•Electrical design

Frequently Asked Questions

What is typical motor efficiency?

IE3 premium efficiency motors typically achieve 88-96% depending on size. Smaller motors are less efficient than larger ones.

How do I convert kW to HP?

1 HP = 0.7457 kW. Divide kW by 0.7457 to get HP.

Related Calculators

Pump Power Calculator Pump Efficiency Calculator Pump Energy Cost Calculator

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Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.