Calculate hydraulic and shaft power for a pump from flow, head and efficiency.
Hydraulic power is the useful work delivered to the fluid; dividing successively by pump and motor efficiency gives the electrical input. The product of the two efficiencies is what determines running cost. Pumping is often the largest electrical load in a facility, and annual energy at continuous duty dwarfs the capital cost of a better pump.
Pump Power
Hydraulic power = ρ g Q H; shaft power divides by pump efficiency, electrical by motor efficiency
Hydraulic power = ρ g Q H; shaft power divides by pump efficiency, electrical by motor efficiency Hydraulic power is the useful work delivered to the fluid; dividing successively by pump and motor efficiency gives the electrical input. The product of the two efficiencies is what determines running cost.
Pumping is often the largest electrical load in a facility, and annual energy at continuous duty dwarfs the capital cost of a better pump.
This calculator takes 5 inputs: Flow rate, Total head, Pump efficiency, Motor efficiency, Fluid density. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.