Calculating the Volume (Gallonage) of Your Swimming Pool

Knowing the volume of water (in gallons) in your swimming pool is important in all areas of swimming pool maintenance and chemical applications. It is also vital to know when choosing the appropriate pool equipment for your swimming pool. Simply stated, the volume of your pool is a calculation of your swimming pool's dimensions multiplied by your pool's average depth. What follows is a chart designed to help you estimate the gallonage in your style swimming pool. After that we have posted many of the most common dimensions with their calculated gallonage.

Chart To Estimate Gallonage of Swimming Pools

Average Depth = depth at the deep end + the depth at the shallow end / 2.

Rectangular Pools - Multiply length x width x average depth x 7.5 = gallons

Round Pools - Multiply diameter x diameter x average depth x 5.9 = gallons

Oval Pools - Multiply full width x full length x average depth x 6.7 = gallons

* Irregular shapes and size pools capacity should be determined by your pool builder or specialist.

* If your pool has sloping sides, multiply your final figure of gallonage by 0.85 for correct gallonage.

Common Pool Sizes and Gallonage Capacity

Round Pools 48" Deep

15ft - 5310 Gallons
18ft - 7646 Gallons
21ft - 10,407 Gallons
24ft - 13,593 Gallons
27ft - 17,204 Gallons
28ft - 18,502 Gallons

Above Ground Ovals 48" Deep

12x24 - 4502 Gallons
15x24 - 9648 Gallons
15x25 - 10,050 Gallons
15x30 - 12,060 Gallons
16x24 - 10,291 Gallons
16x32 - 13,721 Gallons
18x33 - 15,919 Gallons
18x36 - 17,366 Gallons
15x41 - 16,482 Gallons

Common Inground Sizes

16x32 - 19,200 Gallons
16x34 - 20,400 Gallons
16x36 - 21,600 Gallons
18x36 - 24,300 Gallons
20x40 - 30,000 Gallons
24x44 - 39,600 Gallons

*avg depth figured at 5ft.

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