Swimming Pool Water Volume Calculator & Charts

How to calculate the Water Volume of a Swimming Pool using Charts or a Calculator

Why do you need to know you Pool's Water Volume?

In order to figure out proper doses of chemicals for your pool, you need to accurately determine how many gallons of water it holds. To do that, you need to know four different numbers: the length, width, average depth, and a multiplier for your type of pool.

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Here is the pool volume formula:

Length x Width x Average Depth x Multiplier = Volume in US Gallons

Determine the Multiplier:

Multiplier = 7.5 for Rectangle, Square, or Free-Form pools
Multiplier = 5.9 for Round or Oval pools

Determine the Average Depth:

To determine the average depth in a pool where the bottom slopes, measure the shallow end, the deep end depth. Add them together and divide by two (2).

Example:

Shallow End = 2ft. Deep End = 10ft
2ft + 10ft = 12ft; 12/2 = 6ft average depth

Standard In-Ground Pool Volumes in Gallons by Size
Pool Size (in feet)	3.5 ft Avg Depth	4 ft Avg Depth	4.5 ft Avg Depth	5 ft Avg Depth
12x24	7,600	8,600	9,700	10,800
14x28	10,300	11,800	13,200	14,700
15x30	11,800	13,500	15,200	16,900
16x32	13,400	15,400	17,300	19,200
18x36	17,000	19,400	21,900	24,300
19x38	19,000	21,700	24,400	27,100
20x40	21,000	24,000	27,000	30,000
22x44	25,400	29,000	32,700	36,300
25x45	29,531	33,750	37,968	42,187
25x50	32,800	37,500	42,200	46,900
30x50	39,375	45,000	50,525	56,250

Use this Pool Volume Calculator!!

(works with Square, Rectangle, Grecian, Roman
& is a good approximation for Ovals & Freeform pools)

Length in feet

Width in feet

Depth (deep end)

Depth (shallow end)

Approximate US gallons

Approximate UK gallons

Above Ground Swimming Pool Water Volumes by Size
Size	48in Wall*	52in Wall*
12ft Round	2,975 gals	3,398 gals
15ft Round	4,646 gals	5,310 gals
18ft Round	7,646 gals	8,602 gals
21ft Round	9,106 gals	10,408 gals
24ft Round	11,895 gals	13,594 gals
27ft Round	15,054 gals	17,205 gals
30ft Round	18,585 gals	21,240 gals
33ft Round	22,488 gals	25,700 gals
12x24ft Oval	5,948 gals	6,797 gals
15x30ft Oval	9,293 gals	10,620 gals
16x32ft Oval	10,573 gals	12,084 gals
18x33ft Oval	12,267 gals	14,019 gals
* Assumes water depth is 6 inches less than wall height

Round Swimming Pool Volume Calculator
Diameter in Feet Depth (deep end) in Feet Depth (shallow end) in Feet Approximate US gallons Approximate UK Gallons

Round Swimming Pool Volume Calculator

Last Updated: 09/12/2024 02:09 PM - ID:1694