How Much Water Does Your Pool Hold?

Formulas for both In-ground & Above Ground Pools

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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

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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