ClueLuma

Pump electrical input calculator

Hydraulic duty is converted to electrical input by dividing by both pump and motor efficiencies.

Units
P=0.746×Q×H×SG×100×1003960×ηp×ηmP = \frac{0.746 \times Q \times H \times \mathrm{SG} \times 100 \times 100}{3960 \times \eta_{p} \times \eta_{m}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

gpm
ft
ratio
%
%
kW

Worked example

Given

  • QQ = 500 gpm
  • HH = 90 ft
  • SG\mathrm{SG} = 1 ratio
  • ηp\eta_{p} = 75 %
  • ηm\eta_{m} = 93 %
P=0.746×500×90×1×100×1003960×75×93≈12.154P = \frac{0.746 \times 500 \times 90 \times 1 \times 100 \times 100}{3960 \times 75 \times 93} \approx 12.154

Symbols and units

SymbolMeaningUnit
PPpump electrical inputkW
QQvolume flowgpm
HHpump total headft
SG\mathrm{SG}fluid specific gravityratio
ηp\eta_{p}pump efficiency%
ηm\eta_{m}motor efficiency%

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.