Assuming normal shapes and depths, here’s a chart. Otherwise, take a guess, or ask our water lab technician to re-figure it during your next water test.
Round Metal Pools – Gallons
| Size | 48″ | 52″ | 54″ |
| 12′ | 3,500 | 3,800 | 4,000 |
| 15′ | 5,300 | 5,700 | 5,900 |
| 18′ | 7,600 | 8,200 | 8,500 |
| 20′ | 9,400 | 10,000 | 10,400 |
| 21′ | 10,000 | 11,000 | 11,500 |
| 24′ | 13,700 | 14,600 | 15,000 |
| 27′ | 15,900 | 16,800 | 17,400 |
| 28′ | 18,500 | 20,500 | 21,500 |
| 30′ | 19,000 | 21,000 | 22,000 |
| 33′ | 25,000 | 27,500 | 28,500 |
Round Blow-up Pools – Gallons
| Diameter | Height | Gallons |
| 8′ | 30″ | 640 |
| 10′ | 30″ | 1000 |
| 12′ | 30″ | 1500 |
| 12′ | 36″ | 1800 |
| 15′ | 36″ | 2800 |
| 15′ | 42″ | 3300 |
| 15′ | 48″ | 3750 |
| 18′ | 42″ | 4800 |
| 18′ | 48″ | 5500 |
| 18′ | 52″ | 6000 |
Oval Pools – Gallons
| Size | 48″ | 52″ | 54″ |
| 11’ x 18½’ | 6,000 | 6,600 | 6,800 |
| 11’ x 25’ | 8,500 | 9,200 | 9,500 |
| 12’ x 17’ | 6,000 | 6,600 | 6,800 |
| 12’ x 24’ | 8,500 | 9,500 | 9,800 |
| 15’ x 25’ | 9,500 | 10,000 | 10,600 |
| 15’ x 26’ | 10,200 | 11,000 | 11,400 |
| 15’ x 30’ | 13,700 | 14,800 | 15,400 |
| 18’ x 33’ | 17,500 | 18,900 | 19,600 |
| 18’ x 38’ | 19,500 | 21,000 | 22,000 |
| 18’ x 40’ | 20,500 | 22,000 | 22,900 |
Rectangular Inground Pools – Gallons
| Size | 48″ Shallow to 96″ Deep end |
| 12’ x 24’ | 10,000 |
| 16’ x 32’ | 20,000 |
| 18’ x 36’ | 25,000 |
| 20’ x 40’ | 30,000 |
| 24’ x 44’ | 45,000 |
| 25’ x 50’ | 50,000 |
To calculate other sizes and shapes; all measurements are in feet:
| Round: | Diameter x diameter x average depth x 5.9 |
| or | |
| Round: | Radius x radius x average depth x 23.6 |
| Rectangle: | Length x width x average depth x 7.5 |
| Oval: | Length x width x average depth x 6.6 |
| Free Form: | Surface area (square feet) x average depth x 7.5 |
| Blow-up Pools: | Contact the manufacturer since the walls are not vertical and the collars affect depth, there is no formula |
