Pool Gallon Estimator
Not sure how many gallons of water you need to fill your pool? Use the gallon estimator below to approximate the number of gallons you'll need.
If you have any questions, please measure your pool then call us at (724) 2229059 and we'll calculate the amount for you.
Most inground pools have a variable depth. The chart below assumes a depth of 7' at the deep end and 3' at the shallow end. In addition, the Oval, Grecian, and Kidney shapes vary so the chart below may not exactly match your requirements.
All numbers have been rounded to the nearest 100 gallons.
Above Ground Pools

In Ground Pools

48" Wall Height 
52" Wall Height 
Pool Size 
Gallons 
Pool Size 
Gallons 
15' Round
18' Round 
5,300
7,600 
15' Round
18' Round 
5,800
8,300 
20' Round
24' Round 
9,400
13,600 
20' Round
24' Round 
10,200
15,300 
27' Round
28' Round 
17,200
18,500 
27' Round
28' Round 
18,600
20,000 
11'x25' Oval
11'x30' Oval 
6,500
7.800 
11'x25' Oval
11'x30' Oval 
7,000
8,400 
15'x25' Oval
15'x30' Oval 
8,900
10,600 
15'x25' Oval
15'x30' Oval 
9,600
11,500 
18'x33' Oval
18'x38' Oval 
14,000
16,100 
18'x33' Oval
18'x38' Oval 
15,200
17,500 

Pool Size

Gallons 
12'x24' Rect
16'x32' Rect
16'x36' Rect
18'x36' Rect
20'x40' Rect 
10,800
19,200
21,600
24,300
30,000 
16'x32' Oval
18'x36' Oval
20'x40' Oval 
17,200
21,700
26,800 
17'x33' Grecian
17'x37' Grecian
20'x36' Grecian
20'x44' Grecian 
19,700
22,200
24,300
30,300 
16'x30' Kidney
16'x34' Kidney
20'x38' Kidney 
14,900
16,500
20,200 

If you don't see your size listed, use the following formula for calculating the number of gallons of water you'll need.
Round pool: Take the Diameter times Diameter, times the average depth, times 5.9. For example, for an 18 ft. pool 4 ft. high you would multiply 18 x 18 = 324. Then 324 x 4 = 1,296. Then 1,296 x 5.9 = 7,646.4 gallons needed.
Oval pool: Take the length times width, times the average depth, times 5.9. For example, for an 11' x 30' pool 4 ft. high you would multiply 11 x 30 = 330. Then 330 x 4 = 1,320. Then 1320 x 5.9 = 7,788 gallons needed.
Rectangular pool: Take the length times width, times the average depth, times 7.5. For example, for a 12' x 24' pool 4 ft. high you would multiply 12 x 24 = 288. Then 288 x 4 = 1,152. Then 1,152 x 7.5 = 8,646 gallons needed.
We get very busy once the weather gets warm, so make sure to call us early.

