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Pump Hydraulic Power Calculator

Find a pump’s hydraulic, shaft and electrical power from the duty point. Enter flow, total head, fluid specific gravity and the pump and motor efficiencies for the kW at each stage — useful for motor sizing, energy estimates and running-cost checks.

Duty & efficiencies

Result

Hydraulic power (kW)
Shaft (brake) power (kW)
Electrical input (kW)
Suggested motor (kW)
Hydraulic power P = ρ·g·Q·H. Shaft power = hydraulic ÷ pump efficiency; electrical input = shaft ÷ motor efficiency. The suggested motor adds a ~15% margin and is indicative only — select the next standard frame size and confirm against the manufacturer’s curve and the duty point’s actual efficiency.