In stimulate to number out the suitable doses of chemicals for her pool, you require to recognize how plenty of gallons of water the holds. To do that, you have to use a ruler to measure up your pool to uncover out this four various numbers; Length, Width, typical depth and a multiplier the determines gallons.

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So right here are the formulas to number out exactly how much water is in your swimming pool:These formulas organize true because that both Inground pools too as over ground pools.

Rectangular, Square or Free kind Pools:

Length x width x typical 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 median Depth x 5.9 = full gallons

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

Oval Pools:

Length x width x median Depth x 5.9 = full gallons

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

How to identify the median Depth that a swim Pool where the bottom slopes:

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


First measure the depth that “D”, the shallow finish (usually anywhere from 3′ come 5′), and also then measure the depth of “C”, the deep finish (usually anywhere between 6′ and also 12′) . Then, add them together and divide through 2. This is the typical depth of her pool.

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

3′ + 8′ = 11′

11′ separated by 2 = 5.5.

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

Most usual Sizes of Inground rectangle-shaped Pools

Below, we have produced some comfortable charts that the most popular sizes of poolsand how plenty of gallons that water are 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 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 comprehensive Information because that You:

If you room not using a cabinet phone, and also are using a desktop computer, laptop or tablet, we do have actually a really detailed web page with an ext information to add an virtual Pool Water Calculator on our standard Pool and also Spa desktop computer site.Click right here to watch our E-Z pool Water Calculator page.

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