Mechanical EngineeringP0

Pump Efficiency Calculator

Calculate pump hydraulic efficiency, wire-to-water efficiency, and energy losses.

Inputs

Enter your values below

Flow Rate*m3/h

Total Head*m

Input Power (shaft or motor)*kW

Fluid Density*kg/m³

Result

Pump Efficiency

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Enter values and click Calculate

Formula

density × flow × 9.81 × head ÷ power_input × 100

Result unit: %

Efficiency η = Hydraulic Power / Shaft Power × 100%. Hydraulic = ρQgh (W); power_input converted to W by engine. Result in percent.

Introduction

Calculate pump efficiency from hydraulic output power and input shaft power. Typical centrifugal pump best efficiency point (BEP) is 70-85%. Wire-to-water efficiency also accounts for motor efficiency.

Calculation Example

100 m³/h × 50m head, 22 kW shaft input: 62.1% efficiency. Hydraulic power = 13.65 kW.

Inputs: flow=100, head=50, power_input=22, density=1000

Result: 62.1 %

Engineering Applications

•Pump performance evaluation
•Energy audits
•Pump replacement decisions
•Operating cost estimation

Frequently Asked Questions

What is good pump efficiency?

Centrifugal pumps: 70-85% at BEP for medium/large pumps; 50-70% for small pumps. Positive displacement: 65-80%.

What is wire-to-water efficiency?

It includes motor efficiency: η_total = η_pump × η_motor. Typical motor efficiency is 85-95%, so wire-to-water is 60-75%.

Related Calculators

Pump Power Calculator Pump Energy Cost Calculator Motor Power Calculator

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