Determining the volume of a rectangular pool is pretty straightforward, but your calculation will vary slightly depending on the slope of the bottom of your pool. To determine the volume of a pool with variable depths, you need to calculate the average depth of the pool. Do this by adding the the shallow end to the deep end and dividing by 2. For round pools, you need to start by getting the full diameter of the pool. Divide that diameter by 2 to get the radius of the pool.
After you get the radius and depth, plug those into the formula below. Irregularly shaped freeform pools are super popular and a lot of fun from a design perspective , but can be a bit of a headache when calculating pool water volume. For those pools, we must estimate their volume by measuring dimensions and doing some calculations. You can use a laser measuring tool. Set up a bucket or test kit on the opposite side of the pool, and aim the laser at it.
This is a fast and easy way to measure dimensions of your pool accurately. Make note on the pole how deep the water comes up on the pole, then measure it when you pull it out of the water. Pool volume is calculated based on length, width, and average depths. Basically we are trying to figure out the cubic area of the entire swimming pool, then multiply by a given volume of water per that cubic unit of measurement.
Here are the multipliers, depending on the units of measurement you use. The infographic above which we spent WAY too much time creating ourselves gives you the basics for those common shapes of pools. Obviously, free form pools that are not conveniently kidney-shaped are more difficult.
Length x Width x Average Depth x 7. Average depth requires—at a minimum—measuring the deepest depth and the shallowest, and finding the average of the two. But some pools have mostly shallow and a steep drop off into a small deep area, or vice versa. In cases like that, it can be helpful to take more than two depth measurements to get a more accurate average depth measurement. A normal rectangular pool is fairly straightforward to calculate volume.
Multi-shaped pools, however, need to be calculated by dividing the pool into sections, then adding them together. For instance, an L shape pool should be divided into two rectangles, then add the two volumes of water together. Surface Area x Average Depth x 7. After you know the area, all you need is to know the average depth.
Spas are usually pretty easy. Measure the depth of the bench, and the depth of the floor. Knowing this, you can return to the formula:.
In measuring the capacity of a circular spa , you might need to calculate two or three areas within the hot tub and add them together to arrive at a total volume. An empty circular hot tub looks like an upside-down wedding cake, because of the seats. Therefore, you might want to treat it as two separate volumes-the volume above the seat line and the volume below.
In the wooden hot tub, where there is actually water above and below the seats, the tub can be measured as if there are no seats because this difference is negligible. There are two methods used to calculate the capacity of irregular shapes. First, you can imagine the pool or hot tub as a combination of smaller, regular shapes. Measure these various areas and use the calculations described previously for each square or rectangular area and for each circular area.
Add these volumes together to determine the total capacity. The total of measurement A plus measurement B multiplied by 0. The rest of the calculations you are now familiar with. Try this volume calculation:. One of the most important calculations you will use is parts per million ppm. The amount of solids and liquids in the water is measured in parts per million, as in three parts of chlorine in every one million parts of water, or 3 ppm. However, one gallon of chlorine, for example, poured into one million gallons of water does not equal 1 ppm.
That is because the two liquids are not of equal density. This becomes obvious since a gallon of water weighs 8. The chlorine is a denser liquid; there's more of it than an equal volume of water. A New Generation of Pool Finishes. Pool Volume Calculator Save. Rectangle Circle Triangle. Depth Depth 2 optional :.
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