# Converting Pump Head to Pressure and Vice Versa

## Converting head (ft or m) to pressure (psi or bar, kg/cm2) and vice versa

Pumps characteristic curves are often in head - feet or meters - and a conversion to pressure scales commonly used in pressure gauges - like psi or bar - may be required.

#### Converting head in feet to pressure in psi

Pumps characteristic curves in feet of head can be converted to pressure - psi - by the expression:

p = 0.433 h SG                            (1)

where

p = pressure (psi)

SG = specific gravity of the fluid

#### Converting head in meter to pressure in bar

Pumps characteristic curves in meter of head can be converted to pressure - bar - by the expression:

p = 0.0981 h SG                          (2)

where

p = pressure (bar)

#### Converting head in meter to pressure in kg/cm2

Pumps characteristic curves in meter of head can be converted to pressure - kg/cm2 - by the expression:

p = 0.1 h SG                          (2b)

where

p = pressure (kg/cm2)

Since pressure gauges often are calibrated in pressure - psi or bar - a conversion to the heads commonly used in pump curves - like feet or meter - may be required.

#### Converting pressure in psi to head in feet

h = 2.31 p / SG                          (3)

where

p = pressure (psi)

#### Converting pressure in bar to head in meter

h = p 10.197 / SG                          (4)

where

p = pressure (bar)

#### Converting pressure in kg/cm2 to head in meter

h = p 10 / SG                           (4b)

where

p = pressure (kg/cm2)

### Example - Converting Pump Head - feet - to Pressure - psi

The pressure - psi - of a water pump operating with head 120 ft can be calculated as:

p = (120 ft) 1 / 2.31

= 52 psi

### Example - Converting Pressure - psi - to Pump Head - feet

The head in feet water column can be calculated from pressure 100 psi as:

h = 2.31 (100 psi) / (1)
= 231 ft

Where specific gravity of water = 1.

### Feet of Head Water to psi

(ft)
Pressure
(psi)
1 0.43
2 0.87
3 1.30
4 1.73
5 2.17
6 2.60
7 3.03
8 3.46
9 3.90
10 4.33
20 8.66
30 12.99
40 17.32
50 21.65
60 25.99
70 30.32
80 34.65
90 38.98
100 43.31
120 51.97
140 60.63
160 69.29
180 77.96
200 86.62
250 108.27
300 129.93
350 151.58
400 173.24
500 216.55
600 259.85
700 303.16
800 346.47
900 389.78
1000 433.0
• water at 62oF

## Related Topics

• Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

## Tag Search

• en: pump head pressure converter
• es: Conversor de carga de la bomba
• de: Pumpenkopf Druckwandler

## Search the Engineering ToolBox

- "the most efficient way to navigate!"

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!