Pump Affinity Laws Calculator vs Pump Power and Efficiency Calculator
Two calculators for the same neighbourhood of questions. Here is what each measures, what you feed in, and where you'd reach for one over the other.
Pump Affinity Laws Calculator
Predict how a centrifugal pump's flow, head, and power change when its speed or impeller size is altered, using the pump affinity laws. Ideal for engineers optimising pump operation or evaluating variable-speed drives.
- Answers
- New Value (variable)
- Inputs
- Original Flow Rate, Original Head, Original Power, Original Speed, New Speed, Calculate
Pump Power and Efficiency Calculator
Calculates the shaft power a pump must deliver to move fluid against a given head, accounting for pump efficiency. Used when selecting pumps for water supply, irrigation, HVAC, and industrial process systems.
- Answers
- Required Power (kW)
- Inputs
- Flow Rate, Total Head, Fluid Density, Pump Efficiency
At a glance
| Pump Affinity Laws Calculator | Pump Power and Efficiency Calculator | |
|---|---|---|
| Category | Fluid Mechanics | Fluid Mechanics |
| Answers | New Value | Required Power |
| Inputs | 6 | 4 |
| Result unit | variable | kW |
When to use each
Predict how a centrifugal pump's flow, head, and power change when its speed or impeller size is altered, using the pump affinity laws. Ideal for engineers optimising pump operation or evaluating variable-speed drives.
Calculates the shaft power a pump must deliver to move fluid against a given head, accounting for pump efficiency. Used when selecting pumps for water supply, irrigation, HVAC, and industrial process systems.