, Par Inc. of Conn, Par Pool & Spa

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The question that everyone wants & needs to know is, "how big is my Pool?"

Here is the answer!

Knowing the proper number of gallons or liters in your swimming pool is very important for successful chemical care & treatment.  And that goes along with first knowing the actual pool dimensions! Oh, we could tell you stories of 50,000 gallon aboveground pools... but here's what you're really after:

Aboveground Pools  -  based on 52" wall height pools, flat bottom (ACTUAL average approximate water depth of 44"; this is the true fill, not the capacity)


Pool Size US Gallons


Surface Area (sq. ft.)
12 ft. Rnd 3,200 12,113 113
15 ft. Rnd 5,000 18,927 177
18 ft. Rnd 7,200 27,255 255
21 ft. Rnd 9,800 37,096 380
24 ft. Rnd 12,800 48,453 453
27 ft. Rnd 16,200 61,323 572
30 ft. Rnd 20,000 75,708 707
12 ft x 24 ft Oval 6,400 24,226 240
15 ft x 24 ft Oval 8,000 30,283 330
15 ft x 30 ft Oval 10,000 37,854 410
18 ft x 33 ft Oval 13,000 49,210 550

Inground Pools - based on a typical, rectangular (2 ft. radius corners), vinyl liner construction (ANSI / NSPI standard Type 1 Pool, 16x32 and larger; smaller pools are Type 0 with deep depth of 5'6") , with average wall height of 42", shallow end water fill of 36" depth and a deep end water fill depth of 7'6" (90").  Gallonage also takes typical piping & filtration system (100 lineal feet of pipe plus filter capacity) into consideration.

Pool Size US Gallons


Surface Area (sq. ft.)
12 ft x 24 ft 8,900 33,690 288
14 ft x 28 ft 12,000 45,424 392
15 ft x 30 ft 13,800 52,239 450
16 ft x 32 ft 21,200 80,250 512
16 ft x 36 ft 23,900 90,471 576
18 ft x 36 ft 26,900 101,827 648
20 ft x 40 ft 33,000 124,918 800
20 ft x 44 ft 36,700 138,924 880

Gallonage Calculations (US gallons):
Rectangular Pools - length x width x average depth x 7.5
Round, Oval & Free-form Pools - aver. length x aver. width x aver. depth x 5.9

Convert to Liters:  Gallons multiplied by 3.7854 = total liters

If you still need help, here's how to reach us:

Telephone (during store hours): Shelton  203-377-0100

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