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Pump power calculator

Estimate hydraulic power, shaft power, and suggested motor rating from flow, head, specific gravity, and efficiency.

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Flow (m³/hr)

Head (m)

Specific gravity

Efficiency (%)

Hydraulic power

Shaft power

Suggested motor

Hydraulic power (kW) = Q × H × SG × 9.81 / 3600, Shaft power (kW) = Hydraulic power / efficiency

If Q = 9 m³/hr, H = 473 m, SG = 0.75, and efficiency = 70%, hydraulic power ≈ 8.70 kW and shaft power ≈ 12.43 kW.