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How To Calculate Water Volumes & Flow Rates In Different Units

You will almost certainly at some time or another need to convert volumes or flow rates from one type of unit system to another. For example gallons in the UK are not the same as in the USA. In fact 1 imperial gallon is equal to 1.20 US gallons as you will see from table below.

How To Use This Table

Look for the cell which contains the number 1 (in yellow). Then read across the row. This is explained below.

This is particularly helpful in specifying pond and waterfall pumps

 

Unit US galls/min Imp galls/min Cu Feet/min Litres/min Cu. M/min Lbs water/min
US gallons 1 0.83 0.13 3.79 0.004 8.3
Imp Gallons 1.20 1 0.16 4.55 0.005 10.0
Cu Feet 7.48 6.23 1 28.32 0.028 62.4
Litres 0.26 0.22 0.04 1 0.001 2.2
Cu. Metres 264.20 220.00 35.32 1,000.00 1 2,202.7

Example: for a pump doing 4 litres per minute what is flow in other units? To get the answer just multiply the number in the other columns by (in this case) 4 as shown below;

Litres 1.06 0.88 0.14 4 0.004 8.8

Expressed another way 4 litres per minute is the same as the units below

Flow in US gallons/min is 0.26
Flow in Imp gallons/min is 0.22
Flow in Cu feet/min is 0.04
Flow in Cu metres/min is 0.001
Weight of water in lbs/min is 2.20

Actual conversion factors read across eg 1 US gall = 0.1337 cu feet

or 1 litre = 0.2642 US gallons, or 0.2200 Imperial gallons

  US Imp Cu Feet Litres Cu. Metres Pounds
Gallons Gallons
US 1 0.8327 0.1337 3.7854 0.0038 8.3380
Gallons
Imp 1.201 1 0.161 4.546 0.005 10.013
Gallons
Cu Feet 7.481 6.229 1 28.317 0.028 62.371
Litres 0.2642 0.2200 0.0353 1 0.0010 2.2029
Cu. Metres 264.2 220.0 35.3 1000.0 1 2202.7

Use to convert flow rates Read across

  US gpm Imp gpm Cu Metres/hr Litres per Hr
US gpm 1.000 0.833 0.227 227.100
Imp gpm 1.201 1.000 0.273 272.900
Litres per Sec 0.0044 0.0037 0.0010 1.0000

This page reprinted with permission of The Pond Professor

 

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