In stimulate to figure out the suitable doses of chemicals for her pool, you need to identify how countless gallons the water that holds. To perform that, you have to use a ruler to measure your pool to find out these four different numbers; Length, Width, typical depth and a multiplier the determines gallons.

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So below are the recipe to number out how much water is in her swimming pool:These formulas hold true for both Inground pools too as over ground pools.

Rectangular, Square or Free form Pools:

Length x broad x mean Depth x 7.5 = complete gallons

For example: 16′ x 32′ x 4.5′ x 7.5 = 17,280 Gallons

Circular Pools:

Diameter x Diameter x typical Depth x 5.9 = complete gallons

For example: 18′ x 18′ x 4′ x 5.9 = 7,646 Gallons

Oval Pools:

Length x broad x median Depth x 5.9 = complete gallons

For example: 15′ x 30′ x 4′ x 5.9 = 10,620 Gallons

How to identify the mean Depth the a swimming Pool whereby the bottom slopes:

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


First measure the depth that “D”, the shallow finish (usually all over from 3′ to 5′), and also then measure up the depth the “C”, the deep finish (usually anywhere in between 6′ and also 12′) . Then, add them together and divide through 2. This is the median depth of your pool.

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

3′ + 8′ = 11′

11′ divided by 2 = 5.5.

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

Most typical Sizes of Inground rectangle-shaped Pools

Below, us have produced some handy charts the the most renowned sizes of poolsand how many gallons the water space in them.

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12′ X 24′8,6409,72010,80011,88012,960
14′ X 28′11,76013,23014,70016,17017,640
15′ X 30′13,50015,20019,90018,60020,250
16′ X 32′15,40017,30019,20021,10023,040
18′ X 36′19,40021,90024,30026,70029,160
20′ X 40′24,00027,00030,00033,00036,000
25′ X 45′33,75037,96842,18746,40650,625
25′ X 50′37,50042,20046,90051,60056,250
30′ X 50′45,00050,52556,25061,87567,500

Most typical Sizes Of over Ground Pools


Above soil Pools v a Depth the 48″ (4′)



12′ Round3,398
15′ Round5,310
18′ Round7,646
21′ Round10,407
24′ Round13,593
27′ Round17,204
28′ Round18,502
30′ Round21,240
33′ Round25,700
15′ x 30′ Oval10,620



12′ Round3,823
15′ Round5,973
18′ Round8,602
21′ Round11,708
24′ Round15,292
27′ Round19,354
28′ Round20,815
30′ Round23,895
33′ Round28,912
15′ x 30′ Oval11,947

More detailed Information for You:

If you room not utilizing a cell phone, and are using a desktop computer computer, laptop or tablet, we do have a very detailed page with much more information plus an virtual Pool Water Calculator on our classic Pool and Spa desktop computer site.Click below to check out our E-Z pool Water Calculator page.

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