Pump Selection Calculator
Input Data
Enter your project data
Determines the pump type in the specification (circulator, booster, fire pump set, drainage pump)
System design flow rate the pump must deliver at the operating point.
Total system head (static + friction losses) the pump must overcome at the required flow — e.g. from the Pressure Loss or System Curve calculator.
Calculation Results
Calculated instantly from your inputs
Pump Duty Point & Specification
Gives the pump specification from the required duty point (flow and head): pump type, hydraulic power, typical efficiency, shaft power and motor size, plus NPSH and selection notes. No brand or model is named - take the duty point to the manufacturer's selection program (Grundfos Product Center, Wilo-Select, KSB EasySelect …) or to your supplier.
Key Points:
- Duty point as pump specification: flow, head, power, motor size
- Pump type chosen for the system (circulation, boosting, fire, drainage)
- Brand-neutral: no pump models are suggested
- Use the duty point in the manufacturer's selection program
- NPSH and best-efficiency-range selection notes
Formula Variables:
Q
Flow Rate
(m³/h)
H
Head
(m)
Q_BEP
Best Efficiency Point Flow
(m³/h)
η
Efficiency
(%)