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 |