poolchemistrycalc

Pool sizes in gallons

16 standard pool sizes, from

3,240gal up to 32,900 gal

Every figure is computed from the footprint and the depth of water in it, not from the size printed on the box.

Every one of the 16 pool sizes on this site as a bar of the water it holds, from 3,240 gal to 32,900 gal. Round pools 12 ft round 3,240 15 ft round 5,070 18 ft round 7,300 21 ft round 9,930 22 ft round 10,900 24 ft round 13,000 27 ft round 16,400 Oval pools 12 × 24 ft oval 6,490 15 × 30 ft oval 10,100 18 × 33 ft oval 13,400 Rectangular pools 10 × 20 ft 8,230 14 × 28 ft 16,100 16 × 32 ft 21,100 16 × 36 ft 23,700 18 × 36 ft 26,700 20 × 40 ft 32,900 gallons

Every size on the site

Round pools

Size Water Holds
12 ft round 46 in
from a 52 in wall		 3,240 gal
15 ft round 46 in
from a 52 in wall		 5,070 gal
18 ft round 46 in
from a 52 in wall		 7,300 gal
21 ft round 46 in
from a 52 in wall		 9,930 gal
22 ft round 46 in
from a 52 in wall		 10,900 gal
24 ft round 46 in
from a 52 in wall		 13,000 gal
27 ft round 46 in
from a 52 in wall		 16,400 gal

Oval pools

Size Water Holds
12 × 24 ft oval 46 in
from a 52 in wall		 6,490 gal
15 × 30 ft oval 46 in
from a 52 in wall		 10,100 gal
18 × 33 ft oval 46 in
from a 52 in wall		 13,400 gal

Rectangular pools

Size Water Holds
10 × 20 ft 66 in 8,230 gal
14 × 28 ft 66 in 16,100 gal
16 × 32 ft 66 in 21,100 gal
16 × 36 ft 66 in 23,700 gal
18 × 36 ft 66 in 26,700 gal
20 × 40 ft 66 in 32,900 gal

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Updated October 2026

Sources and dates

Every figure on this page is worked out from the dimensions listed beside it. Nothing here is quoted from an outside source.