SOURCE-ALIGNED CALCULATION WORKSPACE
Pump Power & Motor Sizing Calculator
Calculate pump hydraulic power, shaft power and the validated motor sizing range from flow, TDH, density and efficiency inputs.
C5 · VALIDATED
01Duty point
02Efficiency & margin
ENGINEERING REFERENCE
Pump power and motor sizing calculator
This calculator converts flow, total dynamic head, fluid density and efficiency assumptions into hydraulic power, shaft power and a motor sizing range. It is intended for an initial pump duty review and transparent comparison of efficiency assumptions.
Use the calculated motor range as an engineering input, then confirm starting conditions, service factor, driver availability and the final pump curve before selecting a motor.
How Pump Power Is Calculated
Hydraulic power is based on flow, head, density and gravity. The calculator then applies the entered pump and drive efficiencies to report shaft power and its validated source-workbook motor range.
How Pump Efficiency Changes Shaft Power
For the same flow and head, lower pump efficiency requires more shaft power. Review power at the actual operating point rather than estimating it only from nominal motor size.
Using the Result for Motor Review
Final motor selection also considers the actual pump curve, maximum expected absorbed power, applicable service factor, operating range, electrical standard, starting method and project requirements. This tool does not assign a universal service factor.
Frequently Asked Questions
What is the difference between hydraulic and shaft power?
Hydraulic power is transferred to the liquid; shaft power is the mechanical input required by the pump.
Can I use static head instead of TDH?
Only when it genuinely represents the complete required head for the modeled system.
Why does fluid density matter?
Density affects the power required to deliver a given flow and head.