Before you can start any kind of chemical treatment of your pool water, you will need to know how many gallons are in your pool. There is a simple way to calculate your pool volume that only requires 4 basic numbers:
- The length of your pool
- the width of your pool
- The average depth
- the multiplier factor
The formula is LENGTH x WIDTH x AVERAGE DEPTH x MULTIPLIER = The number of gallons in your pool!
length and width are easy measurements that you get with a tape measure. For round pools the “length and width” will be the same and is just calculated as the longest measurement you can get going from one side to the other.
Multiplier is just a factor that depends on the shape of your pool. A rectangle, square or free form pool has a multiplier of 7.5 . A round or oval pool has a multiplier of 5.9
Average depth is just what is says.The average depth of your pool. Take the deepest point plus the shallowest point. Add them together and devide by two. ( For example : shallow end 3′ deepest end 9′ = 12′ feet combined devided by 2 = 6′ average depth ) For above ground pools take 4″ off of the height of the sidewall ( so a 52″ pool has 48″ of water. A 48″ pool has 44″, etc ).
Example: a 10′ x 20′ rectangle pool with an average depth of 6′ would calculate the water volume as follows: 10 x 20 x 6 x 7.5 = 9,000 gallons !
The charts bellow show the water content of standard round and oval above ground pools, as well as some common size in ground pools. Once you have determined your pool volume, Click pool chemicals to see the eFamilyFun solutions for a perfect sparkeling pool!
Above ground pool 48″ wall
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| 12 ft Round | ~2,975 gallons | 12′ x 24′ Oval | ~ 5,948 gallons |
| 15 ft Round | ~4,646 gallons | 15′ x 30′ Oval | ~ 9,293 gallons |
| 18 ft Round | ~ 7,646 gallons | 16′ x 32′ Oval | ~ 10,573 gallons |
| 21 ft Round | ~ 9,106 gallons | 18′ x 33′ Oval | ~ 12,267 gallons |
| 24 ft Round | ~ 11,895 gallons | ||
| 27 ft Round | ~ 15,054 gallons | ||
| 30 ft Round | ~ 18,585 gallons | ||
| 33 ft Round | ~ 22,488 gallons | ||
Above ground pool 52″ wall
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| 12 ft Round | ~ 3,398 gallons | 12′ x 24′ Oval | ~ 6,797 gallons |
| 15 ft Round | ~ 5,310 gallons | 15′ x 30′ Oval | ~ 10,620 gallons |
| 18 ft Round | ~ 8,602 gallons | 16′ x 32′ Oval | ~ 12,084 gallons |
| 21 ft Round | ~ 10,408 gallons | 18′ x 33′ Oval | ~ 14,019 gallons |
| 24 ft Round | ~ 13,594 gallons | 18′ x 40′ Oval | ~ 19,116 gallons |
| 27 ft Round | ~ 17,205 gallons | ||
| 30 ft Round | ~ 21,240 gallons | ||
| 33 ft Round | ~ 25,700 gallons | ||
In ground Pools
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| POOL SIZE | GALLON 3.5′ Av. DEPTH | GALLON 4′ Av. DEPTH | GALLON 4.5′ Av. DEPTH | GALLON 5′ Av. DEPTH | GALLON 5.5′ Av. DEPTH |
| 12′ x 24′ | 7,600 | 8,600 | 9,700 | 10,800 | 11,900 |
| 14′ x 28′ | 10,300 | 11,800 | 13,200 | 14,700 | 16,200 |
| 15′ x 30′ | 11,800 | 13,500 | 15,200 | 16,900 | 18,600 |
| 16′ x 32′ | 13,400 | 15,400 | 17,300 | 19,200 | 21,100 |
| 18′ x 36′ | 17,000 | 19,400 | 21,900 | 24,300 | 26,700 |
| 19′ x 38′ | 19,000 | 21,700 | 24,400 | 27,100 | 29,800 |
| 20′ x 40′ | 21,000 | 24,000 | 27,000 | 30,000 | 33,000 |
| 22′ x 44′ | 25,400 | 29,000 | 32,700 | 36,300 | 39,900 |
| 25′ x 45′ | 29,531 | 33,750 | 37,968 | 42,187 | 46,406 |
| 25′ x 50′ | 32,800 | 37,500 | 42,200 | 46,900 | 51,600 |
| 30′ x 50′ | 39,375 | 45,000 | 50,525 | 56,250 | 61,875 |
