How Many Gallons Of Water Are In My Pool ?

In order to figure out the proper doses of chemicals for your pool, you need to determine how many gallons of water it holds. To do that, you need to use a ruler to measure your pool to find out these four different numbers; Length, Width, Average depth and a multiplier that determines gallons.

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So here are the formulas to figure out how much water is in your swimming pool: These formulas hold true for both Inground pools as well as above ground pools. Rectangular, Square or Free Form Pools: Length x Width x Average Depth x 7.5 = Total gallons For example: 16′ x 32′ x 4.5′ x 7.5 = 17,280 Gallons

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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

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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

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How to determine the Average Depth of a Swimming Pool where the bottom slopes: Below is a side-shot of the “typical” inground pool that has a shallow end (see “D”), then a slope that leads into the deep end (see “C”). First measure the depth of “D”, the shallow end (usually anywhere from 3′ to 5′), and then measure the depth of “C”, the deep end (usually anywhere between 6′ and 12′) . Then, add them together and divide by 2. This is the average depth of your pool. For example, if your shallow end “D” is 3′, and your deep end “C” is 8′, this would be your formula for the Average Depth: 3′ + 8′ = 11′ 11′ divided by 2 = 5.5. Therefore, in this example, your average depth would be 5 1/2 feet.

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Most Common Sizes Of Inground Rectangular Pools Below, we have created some handy charts of the most popular sizes of pools and how many gallons of water are in them.

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 Common Sizes Of Above Ground Pools

Above Ground Pools with a Depth of 48″ (4′)

Above Ground Pools with a Depth of 52″ (4.5′)

More Detailed Information For You:

If you are not using a cell phone, and are using a desktop computer, laptop or tablet, we do have a very detailed page with more information PLUS an online Pool Water Calculator on our Classic Pool And Spa desktop site.

Click here to see our E-Z Pool Water Calculator page.

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