18 ft round above-ground pool: gallons and litres
A standard 18 ft round above-ground pool with a 52 in wall holds about 7,297 US gallons (27,622 litres) when filled 6 in below the top. Change the size or depth below to match your pool.
Gallons by wall height
| Wall | Water depth | US gallons | Litres | UK gallons | Water weight |
|---|---|---|---|---|---|
| 48 in | 42 in (107 cm) | 6,662 | 25,220 | 5,548 | 55,600 lb |
| 52 in | 46 in (117 cm) | 7,297 | 27,622 | 6,076 | 60,900 lb |
| 54 in | 48 in (122 cm) | 7,614 | 28,823 | 6,340 | 63,540 lb |
Filled right to the top of a 52 in wall it would hold 8,249 gallons — the figure some charts quote. Surface area: 254 ft² (23.6 m²).
Looking after 7,297 gallons
| Raise free chlorine by 1 ppm | 7.5 fl oz of 12.5% liquid chlorine (221 mL) — guidance, follow the label |
|---|---|
| Salt for a salt system (0 → 3,200 ppm) | 195 lb (88 kg), 5 × 40 lb bags |
| Pump flow for an 8-hour turnover | 15.2 GPM (3,453 L/h) |
| Fill time at 6 GPM | 20.3 hours |
| Evaporation at ¼ in a day | about 278 gallons a week |
Work out exact doses with the chlorine and salt calculators, and check your pump with the turnover calculator.
Questions
How many gallons is a 18 ft round pool with a 52 in wall?
About 7,297 US gallons (27,622 litres) filled to 46 in, 6 in below the top of the wall. With a 48 in wall it is 6,662 gallons and with a 54 in wall 7,614.
How many litres is a 18 ft round above-ground pool?
25,220 L with a 48 in wall, 27,622 L with a 52 in wall and 28,823 L with a 54 in wall (6,076 UK gallons for the 52 in wall).
How long does it take to fill a 18 ft round pool?
About 20.3 hours with a 6 gallon-per-minute garden hose for the 52 in wall, or 12.2 hours at 10 GPM.