In bespeak to number out the ideal doses of chemicals for your pool, you require to determine how plenty of gallons the water the holds. To do that, you should use a leader to measure up your pool to discover out these four different numbers; Length, Width, average depth and also a multiplier that 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 above ground pools.

Rectangular, Square or Free type Pools:

Length x width x typical 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 = full gallons

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

How to determine the mean Depth that a swim Pool where the bottom slopes:

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


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

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

3′ + 8′ = 11′

11′ separated by 2 = 5.5.

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

Most typical Sizes the Inground rectangle-shaped Pools

Below, we have created some handy charts that the most popular sizes of poolsand how numerous 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 common Sizes Of above Ground Pools


Above soil 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 detailed Information for You:

If you room not making use of a cabinet phone, and are using a desktop computer, laptop or tablet, us do have a really detailed web page with much more information add to an virtual Pool Water Calculator on our classic Pool and also Spa desktop site.Click here to check out our E-Z pool Water Calculator page.

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