Calculating the volume of water in your pool is essential for making the right choice in terms of maintenance equipment, as well as the dosage of products to be used to clean your pool. Let’s take a look at how to make this all-important calculation.

Why calculate the volume of water in your pond?

Knowing the volume of water in your pool is essential! The filtration system, and in particular the pump, must be adapted to the volume of water, in order to purify the water efficiently. It must be powerful enough: the volume of water in your pool is a decisive factor in making the best choice.
The dosage of maintenance and treatment products also depends on the volume of water in your pool. This increases the risk of overdosing, which can be dangerous if you don’t know the volume of water in your pond. If, on the other hand, you don’t use enough product, your pool water may be unhealthy, with abnormal pH, hardness and alkalinity.

What to do?

Start by considering the shape of your pool, as well as its average depth.
The first step is to calculate the average depth, by adding the maximum depth to the minimum depth, then dividing the result by 2.
If your pool is square or rectangular, multiply the length by the width and the average depth.
In the case of a round pool, you need to measure both diameters of the pool. Then multiply the two diameters by the average depth and 0.78.
If you have an oval pool, multiply the length by the width and 0.89.
If your pool is free-form, you can multiply the length, width, average depth and 0.85 to find its water volume.
Please note that results will be expressed in m3.

What impact can the volume of water in your pool have?

The volume of water in your pool can have an impact on consumption, legislation and installation.


The volume of water in your pool will have an impact on consumption. Operating costs depend not only on power, but also on the quantity of products used, and on heating.
The price per m3 of water varies according to supplier and region. However, the water in your pool is partially renewed, so there’s no need to change the entire pool.
To prevent water loss and save water, clean your pool filter regularly. Another option is to use a tarpaulin to prevent evaporation.


Pool owners must carry out a number of checks and balances, in particular to ensure that the pool has efficient filtration and that the water is renewed (30 L per bather per day). Compliance with health standards includes feeding, treating, filtering, disinfecting and adapting the duration of the water cycle to the volume and use of the pool.


Installing a pool with a large volume of water will be more expensive than a smaller pool. But it seems obvious 😉

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