Water
Pump Power Calculator
Calculate hydraulic power, pump shaft power and motor input power from flow rate, total head and efficiency.
Include static lift, pressure head and pipe friction losses.
%
%
Estimated Motor Input Power
—
Estimated electrical input required at the entered operating point.
Hydraulic power
—
Pump shaft power
—
Motor input power
—
Pump shaft power
—
Motor input power
—
Overall efficiency
—
Converted flow rate
—
Converted head
—
Method:
Hydraulic power = ρ × g × Q × H.
For water, Q is converted internally to m³/s and head to metres.
Hydraulic power (kW) = 1000 × 9.81 × Q × H ÷ 1000.
Pump shaft power = hydraulic power ÷ pump efficiency.
Motor input power = pump shaft power ÷ motor efficiency.
Total dynamic head should include static elevation, required discharge pressure and friction losses.
Actual pump selection should be checked against the manufacturer’s pump curve at the required flow and head.