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Above-ground pool sizes
Above-ground pools come in round sizes from about 12 to 33 ft and oval sizes from about 12 × 18 to 18 × 33 ft. Wall heights are commonly 48, 52 or 54 in.
Round
| Diameter | Surface area | Gallons at 48 in |
|---|---|---|
| 12 ft | 113 sq ft | 3,384 |
| 15 ft | 177 sq ft | 5,288 |
| 18 ft | 254 sq ft | 7,614 |
| 21 ft | 346 sq ft | 10,364 |
| 24 ft | 452 sq ft | 13,536 |
| 27 ft | 573 sq ft | 17,132 |
| 30 ft | 707 sq ft | 21,151 |
| 33 ft | 855 sq ft | 25,592 |
Oval
| Size | Surface area | Gallons at 48 in |
|---|---|---|
| 12 × 18 ft | 170 sq ft | 5,076 |
| 12 × 24 ft | 226 sq ft | 6,768 |
| 15 × 30 ft | 353 sq ft | 10,575 |
| 16 × 32 ft | 402 sq ft | 12,032 |
| 18 × 33 ft | 467 sq ft | 13,959 |
Oval pools usually need side bracing, which can add a couple of feet of clearance each side. Check the kit's footprint, not only the water size. Round pools are generally simpler to install.
Pool size also sets the kit you need: cover, liner, pump and filter.