# Hydraulics calculator – calculate hydraulicsThe use of liquids to transmit force and energy.

## Measurements and units used

 Drive torque T Nm Differential pressure ∆p bar Rotation speed n min-1 Geometr. displacement volumeThe volume of liquid in cm³ in a pump or motor displaced by the upward stroke or other cycle during a rotation of the drive shaft. per rotation Vg cm3 Total efficiency ηt Standard value ca. 0,85 Power P kW Mechanical hydraulicThe use of liquids to transmit force and energy. efficiency ηmh Standard value ca. 0,85 Displacement volume Vg cm3 Volume flow rate qv L/min Volumetric efficiency ηv Standard value ca. 0,9 Gear pump diameter D cm Gear pump length L cm Gear pump gear width W cm

## qv = volume flow rate in in L/min

 Vg = cm3 n = min-1 ηv = (Standard value ca. 0.9)

 P = kW Δp = bar ηt = (Standard value ca. 0.85)

## Vg = geometric displacement volume cm³/U

 qv = L/min n = min-1 ηv = (Standard value ca. 0.9)

 T = Nm Δp = bar ηmh = (Standard value ca. 0.85)

## n = rotation speed in min-1

 qv = L/min Vg = cm3 ηv = (Standard value ca. 0.9)

 P = kW T = Nm

## T = torque in Nm

 Vg = cm3 Δ = bar ηmh = (Standard value ca. 0.85)

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## ∆p = differential pressure in bar

 T = Nm ηmh = (Standard value ca. 0.85) Vg = cm3

 P = kW qv = L/min ηt = (Standard value ca. 0.85)

## P = power in kW

 T = Nm n = min-1

 qv = L/min Δp = bar ηt = (Standard value ca. 0.85)

## Calculate gear pump conveyed volume

D = Gear pump diameter in cm
L = Length of bore in pump casing in cm
W = Gear pump width in cm

Conveyed volume calculation for a gear pump (very accurate approximation)

 D = cm L = cm W = cm

### Calculate hydraulics quickly...

HK Hydraulik GmbH offers all professionals and interested parties ready-made calculators for the most important hydraulic calculations.

Until now, to calculate the Volume flow rate or conveyed volume of a gear pump, technicians had to look up the formulas, pick up a calculator, enter the calculation according to the formula, and recalculate it again to check as a precaution. This could take a whole 15 minutes.

Now you just have to enter the values you know / have calculated / measured into the relevant calculator module, and you get your result straight away.

Please note: when we suggest standard values, this gives you a very close approximation that is good enough for general use. You can of course also enter the actual values instead of the standard values.