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Pump Power Calculator

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 Hydraulic Pump Power

The ideal hydraulic power to drive a pump depends on

  • the mass flow rate the
  • liquid density
  • the differential height

- either it is the static lift from one height to an other or the total head loss component of the system - and can be calculated like

Ph(kW) = q ρ g h / (3.6 106)

        = q p / (3.6 106)                  (1)


Ph(kW) = hydraulic power (kW)

q = flow (m3/h)

ρ = density of fluid (kg/m3)

g = acceleration of gravity (9.81 m/s2)

h = differential head (m)

p = differential pressure (N/m2, Pa)

The hydraulic Horse Power can be calculated as:

Ph(hp) = Ph(kW) / 0.746                                  (2)


Ph(hp) = hydraulic horsepower (hp)

Or - alternatively

Ph(hp) = qgpm hft SG / (3960 η)                              (2b)


qgpm = flow (gpm)

hft = differential head (ft)

SG = Specific Gravity (1 for water)

η = pump efficiency

Example - Power pumping Water, SI Units

1 m3/h of water is pumped a head of 10 m. The theoretical pump power can be calculated as

Ph(kW) = (1 m3/h) (1000 kg/m3) (9.81 m/s2) (10 m) / (3.6 106)

    = 0.027 kW

Example - Power pumping Water, Imperial Units

600 gpm of water is pumped a head of 110 ft. The efficiency ofthe pump i s 60% (0.6) and the specific gravity of water is 1. The pump shaft power can be calculated as

Ph(kW) = (60 gpm) (110 ft) (1) / ((3960) (0.6))

    = 27.8  hp


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

Ps(kW) = Ph(kW) / η                                     (3)


Ps(kW)  = 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:

Online Pump Calculator - Imperial units

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


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