Pump Power Calculator.
Calculate hydraulic kW, required shaft power, and motor size from flow rate and total head. Works for centrifugal, positive displacement, and submersible pumps. Includes service factor and recommended motor rating.
Total head = static lift + friction losses + pressure head
Specific gravity affects shaft power directly
% — Centrifugal: 60–80, PD: 80–90, submersible: 50–70
% — IE2 ≈ 85, IE3 ≈ 90, IE4 ≈ 93
RECOMMENDED MOTOR
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kW (next standard rating)
Hydraulic power
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Shaft power
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Electrical input
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Motor (HP)
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Annual energy (24/7)
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Annual cost (₹8/kWh)
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Phydraulic (kW) = ρ × g × Q × H / 1000
Pshaft = Phydraulic / ηpump
Pmotor = Pshaft / ηmotor
where ρ = 1000 × SG kg/m³, g = 9.81 m/s², Q in m³/s, H in m
Pshaft = Phydraulic / ηpump
Pmotor = Pshaft / ηmotor
where ρ = 1000 × SG kg/m³, g = 9.81 m/s², Q in m³/s, H in m