Pool Chemical Products

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Water Volume Calculation

Before you can dose your swimming pool correctly with your chemical products, you must first know what your pool’s water volume is. This is because the dosing instructions will be based on the volume of water in your pool.

We always recommend asking the pool supplier or manufacturer as the first port of call. Alternatively, you can easily note the water meter readings before and after filling the pool.

You should also work out your water volume in the same unit of measurement that is used on the dosing instructions of your products, so an accurate amount of chemical is used. If you need to convert your units of measurements, you can find out how to do this on our Measurement Unit Conversion Tool page.

How do I Calculate the Capacity of my Swimming Pool?

Here are some guides for working out the capacity of rectangular, square and circular swimming pools using the Metric and Imperial systems:

Capacity of Square or Rectangular Pools

In Cubic Meters (Metric):

Length in Meters x Width in Meters x Average Depth in Meters = Volume in Metres Cubed.

In Gallons (Imperial):

Length in Feet x Width in Feet x Average Depth in Feet x 6.25 = Volume in Gallons.

Capacity of Circular Pools

Calculation Volume of Pool = Π(pi) x rx2 x d.

(Where Π(pi) = 3.14, r = Radius, d = Average Depth)

In Cubic Meters (Metric):

Radius in Metres x Radius in Metres x Average Depth in Metres x 3.1428 = Volume in Metres Cubed.

In Gallons (Imperial):

Radius in Feet x Radius in Feet x Average Depth in Feet x 6.25 x 3.1428 = Volume in Gallons.

Typical Volumes for Circular Above Ground Swimming Pools*

DIAMETER IN FEET DIAMETER IN METRES VOLUME IN GALLONS VOLUME IN M3

10

3.048

1600

7.29

12

3.65

2301

10.46

15

4.57

3608

16.40

18

5.48

5187

23.58

*Average Depth of 1 Metre (39 Inches).