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How Many Gallons Of Water Are In My Pool

Written on:April 12, 2016
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How Many Gallons Of Water Are In My Pool ?

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.

 


How many gallons of water are in my pool?

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


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 = Total gallons

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


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”).

How many gallons of water are in my pool?

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.


 

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.

How many gallons of water are in my pool?

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

 

How many gallons of water are in my pool?

Above Ground Pools with 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

 

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

SIZE

GALLONS OF 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