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# Pipes - Fluid Flow Velocities

## Calculate fluid velocity and volume flow in pipes and tubes.

### Imperial units

Fluid flow velocity in a circular pipe can be calculated with Imperial or American units as

v = 1.273 q / d2

= 0.4084 qgpm / din2                               (1)

where

v = velocity (ft/min, ft/s)

q = volume flow (ft3/s, ft3/min)

d = pipe inside diameter (ft)

qgpm = volume flow (US gal/min, gpm)

din = pipe inside diameter (inches)

#### Online Pipe Velocity Calculator - Imperial Units

volume flow (US gal/min, gpm)

pipe inside diameter (in)

volume flow (ft3/s, ft3/min)

pipe inside diameter (ft)

### SI units

Fluid flow velocity in a circular pipe can be calculated with SI units as

v = 1.273 q / d2                            (2)

where

v = velocity (m/s)

q = volume flow (m3/s)

d = pipe inside diameter (m)

#### Online Pipe Velocity Calculator - SI Units

volume flow (m3/s)

pipe inside diameter (m)

### Example - Flow Velocity in a Steel Pipe

60 US gal/min is flowing through a 4 inch schedule 80 steel pipe. The internal diameter of the pipe is 3.83 in. The velocity can be calculated as

v = 0.4085 (60 gal/min) / (3.83 in)2

= 1.7 ft/s

## Related Topics

• Fluid Mechanics - The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• Fluid Flow and Pressure Loss - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.
• Pipe Sizing - Sizing of steam and condensate pipe lines - pressure loss, recommended velocity, capacity and more.

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## Unit Converters

Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 30

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