![]() Above ground pools are even easier, because they only have one depth throughout. Then just multiply that cubic area by the volume factor (7.48 for gallons). Measure the depth of the bench, and the depth of the floor. After you know the area, all you need is to know the average depth. If you know the diameter or radius of the circle, you can calculate the area with the help of Pi (π). (Surface Area) x (Average Depth) x (7.48) = Pool/Spa Volume in Gallons For instance, an L shape pool should be divided into two rectangles, then add the two volumes of water together. Multi-shaped pools, however, need to be calculated by dividing the pool into sections, then adding them together. In cases like that, it can be helpful to take more than two depth measurements to get a more accurate average depth measurement.Ī normal rectangular pool is fairly straightforward to calculate volume. But some pools have mostly shallow and a steep drop off into a small deep area, or vice versa. (Length) x (Width) x (Average Depth) x (7.48) = Pool Volume in GallonsĪverage depth requires–at a minimum–measuring the deepest depth and the shallowest, and finding the average of the two. Rectangular Pools and Multi-Rectangular Pools Obviously, free form pools that are not conveniently kidney-shaped are more difficult. The infographic above (which we spent WAY too much time creating ourselves) gives you the basics for those common shapes of pools. Here are the multipliers, depending on the units of measurement you use. 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. Pool volume is calculated based on length, width, and average depths. ![]() 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. For depth, use your brush/net/vacuum pole, but without an attachment on it. This is a fast and easy way to measure dimensions of your pool accurately. ![]() Set up a bucket or test kit on the opposite side of the pool, and aim the laser at it. HELPFUL IDEA: Want help measuring? You can use a laser measuring tool. There are several pool volume calculators available online, and our free Orenda App has a Pool Volume Estimator feature that uses the formula provided in the NSPF's Certified Pool Operator (CPO) training manual. For those pools, we must estimate their volume by measuring dimensions and doing some calculations. Some pools are fortunate enough to have a specific volume on record (based on the pool builder's design software). Neither are good outcomes, and will lead to water chemistry challenges. That could mean 10% more chemicals used (assuming you measure chemicals properly in the first place), or it could mean under-dosing the pool every visit. Even veteran pool professionals can eyeball a pool and estimate the volume of it.but how accurately? We have found through surveying many of our customers around the country, that pool volume estimations–without measuring–are often off by more than 2000-3000 gallons (7571 - 11,356 L). It is essential to know the volume of a swimming pool to make accurate chemistry adjustments. "How do I calculate the volume of a pool?" This article will guide you on how to measure a swimming pool and calculate its volume of water.
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