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# Hoses - Pressure Loss vs. Water Flow

Water flow through hoses and pressure loss due to friction:

Nominal diameters are used in the chart.

Hoses -  Internal Diameter vs. External Nominal Diameter
Hose Nominal Diameter
(inches)
Internal Diameter
(inches)

1/8 0.125
3/16 0.1875
1/4 0.25
5/16 0.3125
3/8 0.375
7/16 0.4375
1/2 0.5
5/8 0.625
3/4 0.75
7/8 0.875
1 1
1 1/4 1.25
1 1/2 1.5
2 2
2 1/2 2.5
3 3
3 1/2 3.5
4 4
5 5
6 6

### Example - Water Flow through a Hose and Pressure Loss

2 gpm (7.6 liter/min) flows through a 1/2" garden hose with length 82 feet (25 m). From the diagram above the pressure loss per 100 feet can be estimated to 5 psi. The pressure drop in the hose can be calculated as

(5 psi/100 ft) ((80 ft) / (100 ft)) = 4 psi (0.28 bar)

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