Pump Power Calculator

Calculate pump hydraulic and shaft power 

Hydraulic Pump Power

The ideal hydraulic power to drive a pump depends on the mass flow rate, the liquid density and the differential height

- either it is the static lift from one height to an other, or the friction head loss component of the system - can be calculated as

P_h = q ρ g h / 3.6 10⁶ (1)

where

P_h = power (kW)

q = flow capacity (m³/h)

ρ = density of fluid (kg/m³)

g = gravity (9.81 m/s²)

h = differential head (m)

Shaft Pump Power

The shaft power - the power required transferred from the motor to the shaft of the pump - depends on the efficiency of the pump and can be calculated as

P_s = P_h / η (2)

where

P_s = shaft power (kW)

η = pump efficiency

Online Pump Calculator - SI-units

The calculator below can used to calculate the hydraulic and shaft power of a pump:

q - flow capacity (m³/h)

ρ - density of fluid (kg/m³)

g - gravity (m/s²)

h - differential head (m)

η - pump efficiency

Online Pump Calculator - Imperial units

The calculator below can used to calculate the hydraulic and shaft power of a pump using Imperial units:

q - flow capacity (gpm)

ρ - density of fluid (lb/ft³)

g - gravity (ft/s²)

h - differential head (ft)

η - pump efficiency

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