In this article, we explain how to easily calculate the volume of water based on the shape of your pool, whether it's rectangular, round, sloped, or has a more unique shape.
Calculating water volume for a rectangular or square pool
The rectangular shape is the simplest to calculate. Simply multiply the surface area by the average water height.
Formula: Length X Width X Average Water Height
Imagine a rectangular pool 9 meters long, 4 meters wide, and 1.30 meters deep. The calculation is as follows:
Water volume in cubic meters: 9 X 4 X 1.30 = 46.8 m³
Calculating water volume for a round pool
It is just as simple to calculate the water volume of a round pool.
Formula: Radius X Radius X 3.14 X Average Water Height
For example, for a round pool with a radius of 3 meters and an average height of 1.30 meters, the calculation is:
Water volume in cubic meters: 3 X 3 X 3.14 X 1.30 = 36.7 m³
Calculating water volume for a sloped or inclined bottom pool
To calculate the water volume, first calculate the average depth of the basin by adding the maximum and minimum depths, then divide the result by 2. It should be noted that the depth measurement should be taken from the water's surface, not the basin walls.
Formula: (Minimum Depth + Maximum Depth) / 2
For example, if your pool has a minimum depth of 1.20 meters and a maximum depth of 1.80 meters, the calculation is:
Average basin depth in meters: (1.20 + 1.80) / 2 = 1.50 meters
The water volume is then calculated by multiplying the length, width, and average depth. For a rectangular pool with an inclined bottom, for example, the formula would be:
Formula: Length X Width X Average Depth
If your inclined bottom pool is 9 meters long, 4 meters wide, and has an average height of 1.50 meters, the calculation is:
Water volume in cubic meters = 9 X 4 X 1.5 = 54 m³
Calculating water volume for a free-form pool
Calculating the water volume of a free-form pool is not necessarily more complex than other shapes. For a free-form pool, such as a kidney shape, use the following formula:
Formula: Maximum Length X Maximum Width X Average Water Height X 0.78
For example, if your pool has a maximum length of 11 meters, a maximum width of 5 meters, and an average height of 1.5 meters:
Water volume in cubic meters: 11 X 5 X 1.5 X 0.78 = 64.3 m³
If you want to convert the water volume of your pool into liters, simply multiply the water volume in m³ by 1000; because 1 cubic meter contains 1000 liters of water.
The calculation formula is: m³ x 1000
For example, if your pool is 46 m³, then 46 X 1000 = 46,000 liters of water.
Why is it important to calculate the water volume of your pool?
Knowing the volume of your pool is a fundamental step before undertaking any equipment purchase for your pool. Here are 6 good reasons to calculate the water volume of your pool:
- Correctly adjust water pH: Accurate knowledge of the water volume allows for precise pH adjustment, ensuring healthy and pleasant swimming water.
- Efficiently treat water: For effective disinfection, it is crucial to dose chemicals according to the water volume.
- Choose an appropriate filtration system: The water volume determines the filtration capacity needed to maintain clean and clear water.
- Choose an appropriate heat pump: To heat your pool efficiently, the heat pump must be sized according to the water volume.
- Select specific equipment: Any equipment requiring adjustment based on water volume, such as robotic cleaners or salt electrolysis systems, must be chosen with knowledge of the exact volume.
- Estimate water expenses: Knowing the water volume helps predict costs related to filling and maintaining the pool.
FAQ: Questions you ask us
How to calculate the necessary power of a filtration pump based on your pool size?
To choose the right filtration pump model, knowing the volume of your pool in m³ is essential. Divide the volume of your pool in m³ by 4 to determine the minimum flow rate of your filtration pump.
For example, if your pool is 48m³, the flow rate of your pump should be at least 12m³/h.
Why is it important to choose a salt chlorinator suited to the water volume of your pool?
Undersizing a salt electrolysis device can lead to premature wear of the device. This may seem economical at first but will lead to higher expenses in the long run. The plates of the salt chlorinator will wear out faster, reducing the effectiveness of the treatment.
Once you know the water volume of your pool, choose a model capable of handling slightly more than your pool's volume for optimal performance. Chlorinators are often rated by maximum capacity in m³.
You can now calculate the water volume of your pool with ease! Also discover all our advice to enjoy your pool all year round in the best conditions!
