In stimulate to number out the suitable doses of chemistry for your pool, you require to identify how countless gallons the water the holds. To carry out that, you should use a ruler to measure your swimming pool to uncover out this four various numbers; Length, Width, typical depth and a multiplier the determines gallons.

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

Rectangular, Square or Free kind Pools:

Length x broad x average Depth x 7.5 = full 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 width x average Depth x 5.9 = total 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 that 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 up the depth that “D”, the shallow end (usually all over from 3′ come 5′), and then measure up the depth that “C”, the deep end (usually anywhere between 6′ and 12′) . Then, add them together and also divide through 2. This is the mean depth of your pool.

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

3′ + 8′ = 11′

11′ divided by 2 = 5.5.

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

Most usual Sizes the Inground rectangular Pools

Below, we have developed some handy charts that the most famous sizes that poolsand how countless gallons that 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 usual Sizes Of over Ground Pools


Above soil Pools through a Depth of 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 comprehensive Information for You:

If you are not utilizing a cell phone, and also are using a desktop computer, laptop or tablet, us do have a really detailed page with much more information add to an digital Pool Water Calculator top top our standard Pool and Spa desktop computer site.Click here to view our E-Z swimming pool Water Calculator page.

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