HomeCalculatorsHydraulic Pump - Required Shaft Power

Hydraulic Pump - Required Shaft Power

Shaft power for a hydraulic pump delivering a given flow at a specific pressure - P = Q·p/η.

HydraulicPumpPower
Hydraulic power
125.00kW
Shaft power
156.25kW
Formula, assumptions, and limits

Q in L/min, p in bar gives kW directly (600 factor). Piston pumps 88–92 % total eff; vane 80–85 %; gear 75–85 %. Derate 5 % for cold oil start.

Symbol legend

SymbolMeaningUnitSource
Volumetric flowL/minpump spec
Working pressurebarrelief setting
Overall efficiency - maker data