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How Many Gallons Of Water Are In My Pool

Written on:April 12, 2016

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How Many Gallons Of Water Are In My Pool ?

In order to figure out the proper doses of chemicals for your pool, you need to determine how many gallons of water it holds. To do that, you need to use a ruler to measure your pool to find out these four different numbers; Length, Width, Average depth and a multiplier that determines gallons.

So here are the formulas to figure out how much water is in your swimming pool:
These formulas hold true for both Inground pools as well as 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

How to determine the Average Depth of a Swimming Pool where the bottom slopes:

Below is a side-shot of the “typical” inground pool that has a shallow end (see “D”), then a slope that leads into the deep end (see “C”).

First measure the depth of “D”, the shallow end (usually anywhere from 3′ to 5′), and then measure the depth of “C”, the deep end (usually anywhere between 6′ and 12′) . Then, add them together and divide by 2. This is the average depth of your pool.

For example, if your shallow end “D” is 3′, and your deep end “C” is 8′, this would be your formula for the Average Depth:

3′ + 8′ = 11′

11′ divided by 2 = 5.5.

Therefore, in this example, your average depth would be 5 1/2 feet.

Most Common Sizes Of Inground Rectangular Pools

Below, we have created some handy charts of the most popular sizes of pools
and how many gallons of water are in them.

POOL SIZE	4′ AVG. DEPTH	4.5′ AVG. DEPTH	5′ AVG. DEPTH	5.5′ AVG. DEPTH	6′ AVG. DEPTH
12′ X 24′	8,640	9,720	10,800	11,880	12,960
14′ X 28′	11,760	13,230	14,700	16,170	17,640
15′ X 30′	13,500	15,200	19,900	18,600	20,250
16′ X 32′	15,400	17,300	19,200	21,100	23,040
18′ X 36′	19,400	21,900	24,300	26,700	29,160
20′ X 40′	24,000	27,000	30,000	33,000	36,000
25′ X 45′	33,750	37,968	42,187	46,406	50,625
25′ X 50′	37,500	42,200	46,900	51,600	56,250
30′ X 50′	45,000	50,525	56,250	61,875	67,500

Most Common Sizes Of Above Ground Pools

How many gallons of water are in my pool?

Above Ground Pools with a Depth of 48″ (4′)

SIZE	GALLONS OF WATER
12′ Round	3,398
15′ Round	5,310
18′ Round	7,646
21′ Round	10,407
24′ Round	13,593
27′ Round	17,204
28′ Round	18,502
30′ Round	21,240
33′ Round	25,700
15′ x 30′ Oval	10,620

Above Ground Pools with a Depth of 52″ (4.5′)

SIZE	GALLONS OF WATER
12′ Round	3,823
15′ Round	5,973
18′ Round	8,602
21′ Round	11,708
24′ Round	15,292
27′ Round	19,354
28′ Round	20,815
30′ Round	23,895
33′ Round	28,912
15′ x 30′ Oval	11,947