In bespeak to number out the appropriate doses of chemicals for her pool, you need to identify how plenty of gallons that water it holds. To do that, you must use a ruler to measure up your pool to find out these four various numbers; Length, Width, median depth and also a multiplier the determines gallons.

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

Rectangular, Square or Free form Pools:

Length x broad x mean 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 median Depth x 5.9 = full 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 = full gallons

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

How to recognize the mean Depth that a swimming Pool where the bottom slopes:

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


First measure up the depth that “D”, the shallow end (usually everywhere from 3′ come 5′), and then measure the depth the “C”, the deep end (usually anywhere between 6′ and 12′) . Then, include them together and also divide through 2. This is the average depth of your pool.

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

3′ + 8′ = 11′

11′ divided by 2 = 5.5.

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

Most usual Sizes that Inground rectangular Pools

Below, we have developed some handy charts the the most well-known sizes the poolsand how numerous gallons of water room 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 above Ground Pools


Above floor Pools with a Depth that 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 are using a desktop computer, laptop or tablet, us do have actually a very detailed page with more information add to an digital Pool Water Calculator on our standard Pool and Spa desktop site.Click below to view our E-Z swimming pool Water Calculator page.

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