How To Calculate The Number of Gallons of Water In An Above Ground or Inground Swimming Pool

It’s important to know how many gallons of water are in your swimming pool. A lot of swimming pool  spring startup opening chemical kits are sold based on gallons and it’s important to know so you can properly add the right amount of chemicals during your normal maintenance.

To determine how many gallons of water are in your swimming pool, you basically multiply the length, width, depth, then we also use a “multiplier”.

If you have a sloped pool or a pool with a deep end, you just figure the average depth. Take the depth of the shallow and deep end. Add them together and divde by two. This gives you a rough estimate of the average depth. If you have a flat bottom pool, you guessed it, your average depth is just the depth of your pool

For Round Pools, you multiply the diameter (in feet) times the diameter (in feet) times the average depth (in feet) times 5.9 (the multiplier).

For Oval Swimming Pools, the calculation is roughly the same, but we change the multiplier. To figure the amount of gallons in an above ground swimming pool, it’s length x width x average depth x 6.7 (our multiplier).

For rectangular pools, our equation to figure the amount of water in a swimming pool is lenth x width x average depth x 7.5(our multiplier)

Once you figure out how many gallons of water are in your swimming pool, you can buy the right amount of swimming pool chemicals.
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