
Formulas for both In-ground & Above Ground Pools
Rectangular, Square or Free Form Pools
Length x Width x Average Depth x 7.5 = Total gallons
For example: 16′ x 32′ x 4.5′ x 7.5 = 17,280 Gallons
Circular Pools
Diameter x Diameter x Average Depth x 5.9 = Total gallons
For example: 18′ x 18′ x 4′ x 5.9 = 7,646 Gallons
Oval Pools
Length x Width x Average Depth x 5.9 = Total gallons
For example: 15′ x 30′ x 4′ x 5.9 = 10,620 Gallons
Quick Reference Tables
Capacity of Common Sizes for Rectangular In-ground Pools
Pool Size | 4′ Avg Depth | 4.5′ Avg Depth | 5′ Avg Depth | 5.5′ Avg Depth | 6′ Avg Depth |
---|---|---|---|---|---|
12’x24′ | 8,640 | 9,720 | 10,800 | 11,880 | 12,960 |
14’x28′ | 11,760 | 13,230 | 14,700 | 16,170 | 17,640 |
15’x30′ | 13,500 | 15,200 | 18,600 | 19,900 | 20,250 |
16’x32′ | 15,400 | 17,300 | 19,200 | 21,100 | 23,040 |
18’x36′ | 19,400 | 21,900 | 24,300 | 26,700 | 29,160 |
20’x40′ | 24,000 | 27,000 | 30,000 | 33,000 | 36,000 |
25’x45′ | 33,750 | 37,968 | 42,187 | 46,406 | 50,625 |
25’x50′ | 37,500 | 42,200 | 46,900 | 51,600 | 56,250 |
30’x50′ | 45,000 | 50,525 | 56,250 | 61,875 | 67,500 |
Capacity for Common Sizes of Above Ground Pools
Pool Size | 4′ Depth | 4.5′ Depth |
---|---|---|
12′ Round | 3,398 | 3,823 |
15′ Round | 5,310 | 5,973 |
18′ Round | 7,646 | 8,602 |
21′ Round | 10,407 | 11,708 |
24′ Round | 13,593 | 15,292 |
27′ Round | 17,204 | 19,354 |
28′ Round | 18,502 | 20,815 |
30′ Round | 21,240 | 23,895 |
33′ Round | 25,700 | 28,912 |
15’x30′ Oval | 10,620 | 11,947 |