Pump Power Calculator

Estimate hydraulic power and efficiency-adjusted input power from entered conditions.

Important: This calculator provides an educational estimate only. It is not plumbing, pump, pressure-vessel, dam, turbine, electrical, flood-safety, installation, engineering, legal, or regulatory-compliance advice.

About the Pump Power Calculator

Compare ideal hydraulic power with a simple efficiency-adjusted input estimate.

How to use it

Enter flow and head with units.
Enter fluid density and assumed pump efficiency.
Calculate hydraulic and input power.

Formula

Hydraulic power is density times gravitational acceleration times flow times head. Estimated input power divides hydraulic power by efficiency.

Example

Water at 20 L/s and 15 m head has about 2.94 kW hydraulic power before efficiency adjustment.

Notes

This does not select a pump or account for system curves, motor efficiency, transient conditions or installation losses.