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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POOL SIZE | 4′ AVG. DEPTH | 4.5′ AVG. DEPTH | 5′ AVG. DEPTH | 5.5′ AVG. DEPTH | 6′ AVG. DEPTH |
12′ X 24′ | 8,640 | 9,720 | 10,800 | 11,880 | 12,960 |
14′ X 28′ | 11,760 | 13,230 | 14,700 | 16,170 | 17,640 |
15′ X 30′ | 13,500 | 15,200 | 19,900 | 18,600 | 20,250 |
16′ X 32′ | 15,400 | 17,300 | 19,200 | 21,100 | 23,040 |
18′ X 36′ | 19,400 | 21,900 | 24,300 | 26,700 | 29,160 |
20′ X 40′ | 24,000 | 27,000 | 30,000 | 33,000 | 36,000 |
25′ X 45′ | 33,750 | 37,968 | 42,187 | 46,406 | 50,625 |
25′ X 50′ | 37,500 | 42,200 | 46,900 | 51,600 | 56,250 |
30′ X 50′ | 45,000 | 50,525 | 56,250 | 61,875 | 67,500 |
Most usual Sizes Of over Ground Pools

Above soil Pools through a Depth of 48″ (4′)
SIZE | GALLONS of WATER |
12′ Round | 3,398 |
15′ Round | 5,310 |
18′ Round | 7,646 |
21′ Round | 10,407 |
24′ Round | 13,593 |
27′ Round | 17,204 |
28′ Round | 18,502 |
30′ Round | 21,240 |
33′ Round | 25,700 |
15′ x 30′ Oval | 10,620 |
SIZE | GALLONS the WATER |
12′ Round | 3,823 |
15′ Round | 5,973 |
18′ Round | 8,602 |
21′ Round | 11,708 |
24′ Round | 15,292 |
27′ Round | 19,354 |
28′ Round | 20,815 |
30′ Round | 23,895 |
33′ Round | 28,912 |
15′ x 30′ Oval | 11,947 |
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.Previous post: how To Replace and also Install an Inground swimming pool Ladder