Pump Power Calculator
Calculate hydraulic power, shaft power, and NPSH for centrifugal pumps from flow rate, head, and efficiency
Pump Power Calculator
P_hydraulic = ρgQH · P_shaft = P_hydraulic/η
Power
Hydraulic Power
14.689 kW
ρgQH
Shaft Power (input)
19.585 kW
÷ η_pump
Motor Input
21.288 kW
÷ η_motor
Specific Speed (dimensionless, @ 1450 rpm)
0.478
N_s < 0.3: Radial (centrifugal) · 0.3–2: Mixed flow · > 2: Axial
Formula
P_h = ρgQH = 998.2 × 9.81 × 0.05 × 30
= 14688.5 W = 14.689 kW
How to Use This Calculator
Enter your input values
Fill in all required input fields for the Pump Power Calculator. Most fields include unit selectors so you can work in your preferred unit system.
Review your inputs
Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors.
Read the results
The Pump Power Calculator instantly computes the output and displays results with units. All calculations happen in your browser — no loading time and no data sent to a server.
Formula Reference
Pump Power Calculator Formula
See calculator inputs for the governing equation
Variables: All variables and their units are labeled in the calculator interface above.
When to Use This Calculator
- •Use the Pump Power Calculator when solving homework or exam problems that require quick numerical verification of your hand calculations.
- •Use it during the design phase to rapidly iterate on parameters before running detailed finite element simulations.
- •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility.
- •Use it to generate reference data for a technical report or presentation without manual computation.
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