Water & Utilities · Energy, APFC & Power Quality
Pump Power Calculator
Estimate hydraulic, shaft and electrical power from flow, head, density and efficiencies.
This tool provides a preliminary engineering calculation for reference. Final equipment selection, design and commissioning decisions must consider manufacturer data, applicable standards, operating conditions and project-specific engineering requirements. It is not certified design output.
Preliminary result
Calculated outputs
Enter values and select Calculate. Results are estimates and do not replace nameplate data, applicable standards, or an engineering review.
Use this calculation
Only calculator parameters and results are transferred. Personal details are collected separately in the destination form.
Formula
Phyd = ρgQH
Pshaft = Phyd/ηp
Pelec = Phyd/(ηpηmηd)
Worked example
100 m³/h water at 30 m head and 75% pump efficiency.
Expected check: Hydraulic power = 8.175; Required shaft power = 10.9.
Assumptions
- • Steady incompressible flow
- • Total head and operating-point efficiencies are known
Limitations
- • Not final pump model, motor or VFD selection
- • NPSH, system curve, viscosity, solids and transient duty are excluded
Frequently asked questions
Can this result be used for final equipment selection?
No. Use it for a preliminary check, then verify manufacturer data, site conditions, applicable standards and the complete system design.
What does formula version 1.0.0 mean?
It identifies the exact calculation logic used so a saved result can be traced when the formula register changes.
Can Elexorn review my calculation?
Yes. Transfer the result to Request a Quote or Talk to an Elexorn Engineer and add the relevant project or equipment details.