How does the Pump Power Calculator work?

Calculate: P = (Q × H × ρ × g) / η Then: Or: P = (GPM × Total Head) / (3960 × Efficiency) Then: Account for motor losses beyond pump efficiency.

Can you give an example of how to use the Pump Power Calculator?

Example: Input Q = 0.05 m³/s, H = 20 m, ρ = 1000 kg/m³, η = 0.75 gives a result of P ≈ 13 kW required (Select larger motor for margin).

Is the Pump Power Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Pump Power Calculator?

Our Pump Power Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Maalum

Pump Power Calculator

Flow Rate (gpm)

Pump Head (ft)

Efficiency (%)

Pump power requirement is calculated from flow, head, and efficiency. Proper sizing prevents under-pumping and excessive energy waste.

Symbol	Name	Unit	Description
P	(GPM × Total Head) / (3960 × Efficiency)	—	(GPM × Total Head) / (3960 × Efficiency)
Q	Q value	—	Variable used in the calculation
H	H value	—	Variable used in the calculation

Difficulty:intermediate

References

›Pump Power — Wikipedia

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