Volume by water depth
| Water depth | US gallons | Litres |
|---|---|---|
| 44 in of water | 6,980 gal | 26,420 L |
| 46 in of water | 7,300 gal | 27,620 L |
| 48 in of water | 7,610 gal | 28,820 L |
Formula: 18 × 18 × 3.83 ft × 5.87 = 7,297 gal.
How many gallons is an 18 ft round × 52 in above-ground pool?
An 18 ft round above-ground pool with 52 in walls holds about 7,300 US gallons (27,620 L) when filled to 46 in of water, about 6 in below the top rail. Volume depends on the water depth, not the wall height, so measure your water and check the table.
Measure your own water depth
7,297gal
About 27,622 L
Average depth 3.8 ft
Formula: diameter² × average depth × 5.87.
- Pool shapes are never perfect. Treat this as within about 10%, and check it once by adding a known amount of salt or stabilizer and testing the change.
- Use this volume: Chlorine pH Shock All-in-one
Save this test and get reminded when it is time to retest.
Pool Calc for iPhoneComing soon to the App StoreDoses for this pool
| Job | Amount |
|---|---|
| Raise chlorine 1 ppm | 9.3 fl oz of 10% liquid chlorine |
| Stabilizer 0 → 30 ppm | 1.8 lb |
| Salt 0 → 3,200 ppm | 196 lb (4.9 bags) |
Full dose tables for a pool this size: liquid chlorine for 6,000 gallons, salt and stabilizer. Or put 7,297 gallons straight into the pool chemical calculator.
Check the number once
Manufacturer capacities are usually given at a stated fill level, and liners stretch. To confirm your real volume, add a known amount of salt or stabilizer and see how much the test reading moves: the volume that explains that change is your pool.
Questions
How many gallons does an 18 ft round × 52 in pool hold?
About 7,300 gallons at 46 in of water.
How many litres is an 18 ft round × 52 in pool?
About 27,620 L at 46 in (117 cm) of water.