Pool Volume: How Much Water Is in My Pool?

Pool Volume: How Much Water Is in My Pool?

Knowing your pool’s volume in gallons is important to many facets of pool maintenance. For example, knowing your pool’s volume in gallons helps you calculate correct dosages for chemical treatments, filtration cycles, and sizing of pool equipment. In this article, we show you how to calculate your pool’s gallonage, as well as an easy reference chart for your pool.

The formulas used for calculating your pool’s volume in gallons are based on this Length (ft) x Width (ft) x Constant x Depth (ft). Round and oval pools use a constant of 5.9 and rectangular calculations use 7.5; see below examples.

12′ Round w/48″ Wall A/G Pool: 12 x 12 x 5.9 x 3.5 = 2,794 gallons

12′ x 24′ Oval w/52″ Wall A/ G Pool: 12 x 17 x 5.9 x 3.83 = 5,608 gallons

20′ x 40′ Rectangle, 5′ Average Depth Inground Pool: 20 x 40 x 7.5 x 5 = 30,000 gallons

For above ground pools, we assume the actual fill depth is 6-inches below wall height. We account for that by substituting 3.5 for 48″ wall, 3.83 for 52″ wall, and 4 for 54″ wall. The average depth for inground pools is calculated by averaging the shallow and deep end depths. For example, a 3-foot shallow end with a 7-foot deep end average to 5 feet.

Round A/G Pool Volume Chart

Round Pool Size48" Wall*52" Wall*54" Wall*
12'2,9743,2543,398
15'4,6465,0845,310
16'5,2865,7856,042
18'6,6917,3217,646
20'8,2609,0399,440
21'9,1079,96510,408
24'11,89413,01613,594
27'15,05416,47317,204
28'16,19017,71618,502
30'18,58520,33721,240
33'22,48824,60825,700
36'26,76229,28630,586
*Assumes Pool’s Fill Depth Is 6” Below Wall Height

Oval A/G Pool Volume Chart

Oval Pool Size48" Wall*52" Wall*54" Wall*
12'x17'4,2134,6104,814
12'x20'4,9565,4235,664
12'x24'5,9476,5086,797
15'x24'7,4348,1358,496
15'x25'7,7448,4748,850
15'x26'8,0548,8139,204
15'x27'8,3639,1529,558
15'x30'9,29310,16910,620
15'x33'10,22211,18611,682
16'x24'7,9308,6779,062
16'x32'10,57311,57012,083
18'x33'12,26613,42314,018
18'x44'16,35517,89718,691
21'x43'18,64720,40521,311
*Assumes Pool’s Fill Depth Is 6” Below Wall Height

Rectangle Inground Pool Volume Chart

Inground Pool Size3.5'4'4.5'5'
12'x24'7,5608,6409,72010,800
14'x28'10,29011,76013,23014,700
16'x32'13,44015,36017,28019,200
16'x36'15,12017,28019,44021,600
18'x36'17,01019,44021,87024,300
20'x40'21,00024,00027,00030,000
20'x44'23,10026,40029,70033,000
24'x40'25,20028,80032,40036,000
25'x45'29,53133,5037,94942,188
25'x50'32,81337,50042,18846,876
30'x50'39,37545,00050,62556,250
30'x60'47,25054,00060,75067,500

Do you have any questions about your pool size? Leave a comment down below and we’d be happy to answer you.

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