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How many gallons in a 18 ft round pool?
About 7,600 gallons (28,800 liters), with 48 in of water. An 18 ft pool is a popular middle size: big enough to float and play, and small enough that most yards can fit one.
| Water depth | Gallons | Liters |
|---|---|---|
| 42 in of water | 6,662 | 25,220 |
| 48 in of water | 7,614 | 28,823 |
| 54 in of water | 8,566 | 32,426 |
Surface area is 254 sq ft for the circle, and each extra inch of water adds about 159 gallons, so a level check is worth doing.
What this size needs
| Salt for a new salt system, to 3,200 ppm | 203 lb (6 × 40 lb bags) |
| 1 ppm of chlorine, 10% liquid | 10 fl oz |
| Shock to 10 ppm, 65% cal-hypo | 16 oz |
| Pump flow for an 8-hour turnover | 16 GPM |
| Fill time at 9 GPM | 14.1 hours |
Based on 7,600 gallons. For your exact volume, use the pool volume calculator.