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.
The volume of your pool is a calculation of your swimming pool's dimensions multiplied by your pool's average depth. The following chart is designed to help you estimate the gallonage in your style swimming pool. We have also posted many of the most common dimensions with their calculated gallonage.
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.
Above Ground Pools (48" deep)
Pool Size |
US Gallons |
12 ft. Rnd |
3,200 |
15 ft. Rnd |
5310 |
18 ft. Rnd |
7646 |
21 ft. Rnd |
10,407 |
24 ft. Rnd |
13,593 |
27 ft. Rnd |
17,204 |
28 ft. Rnd |
18,502 |
30 ft. Rnd |
21,240 |
12 ft x24 ft Oval |
6,400 |
15 ft x24 ft Oval |
8,000 |
15 ft x 30 ft Oval |
10,000 |
18 ft x 33 ft Oval |
13,000 |
Inground Pools (Average Depth 5 Feet)
Pool Size |
US Gallons |
12 ft x 24 ft |
10,800 |
14 ft x 28 ft |
14,700 |
15 ft x 30 ft |
16,875 |
16 ft x 32 ft |
19,200 |
16 ft x 34 ft |
20,400 |
16 ft x 36 ft |
21,600 |
18 ft x 36 ft |
24,300 |
20 ft x 40 ft |
30,000 |
20 ft x 44 ft |
33,000 |
24 ft x 44 ft |
39,600 |