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The **gallon** (symbol **gal** ) is a unit of volume that is used in Anglophone countries (especially the United States ) or influenced by them (such as Liberia, Guatemala, Panama, Honduras, Nicaragua, El Salvador and Colombia ) to measure volumes of liquids, mainly gasoline and its price. Formerly, the volume of a gallon depended on what was measured, and where. However, in the nineteenth century two definitions of commonly used were: “gallon of wine” (*wine gallon*) and “British gallon of beer” (*ale gallon*).

This is a question that a google search solves but, it depends on what is meant by the gallon.

There are two volume units called a gallon,

**The British gallon****The American gallon**

## Imperial or British gallon

In 1824 , Britain adopted an approximation of the gallon of beer known as the imperial gallon. This gallon was based on the volume of 10 pounds of heavy distilled water in the air, with a barometric pressure of 30 inches of mercury (1016 millibars / mbar or 101.6 kPa ) and at a temperature of 62°F (16,667°C ) , from which 277,41945 cubic inches result (1 inch = (2.54 cm), one cubic inch = 16.387064 cm ^{3} ).

An *imperial or British gallon also in Anglo-Saxon system is* equivalent to:

- 4,5460902819948 liters (rounded to 4,5461 liters).
- 0.028571428571429 British barrels
- 4 british rooms
- 8 british pints
- 32 British gills
- 160 British fluid ounces

## American gallon

**Liquid gallon**

The USgal US liquid gallon (often called simply “gallon”) is legally defined as 231 cubic inches, which is exactly 3.785411784 liters. A gallon of water weighs approximately 8.34 pounds (3.78 kg) at 62 ° F (17 ° C), making it approximately 16.6% lighter than the imperial gallon.

There are 4 quarts in a gallon, 2 pints in a quarter and 16 ounces in 1 pint, which makes 1 ounce equal to 1/128 US gallon.

To overcome the effects of expansion and contraction with temperature when a gallon is used to specify a quantity of material for commercial purposes, it is common to define the temperature at which the material will occupy the specified volume. For example, the volume of petroleum products and alcoholic beverages are referenced at 60 ° F (15.6 ° C) in government regulations.

In addition to the United States ( Puerto Rico, Panama, Peru, Colombia , Ecuador and Venezuela ) they use the definition of gallon that is equivalent to:

- 3.785411784 liters (rounded to 3.7854 liters)
- 0.0238095238095240 US barrels
- 8 American pints
- 32 US gills

**Dry gallon**

The dry gallon, also known as a gallon of corn or gallon of grain, is a historical British measure of dry volume that was used to measure grain and other dry products and whose official definition recorded earlier in 1303 was the volume of 8 pounds of wheat. It is not used in the traditional US system, although it exists implicitly, but without recognition of authority in the measurement law. The US liquid gallon it is approximately 14.1% smaller than the dry gallon, while its imperial counterpart is approximately 3.2% larger.

Its implicit value in the American system was originally 1/8 of bushel Winchester, which was a cylindrical measure of 18.5 inches (0.45 m) in diameter and 8 inches (0.2 m) deep, which made The dry gallon was an undetermined number of cubic inches. Since it was later defined that the bushel was exactly 2150.42 cubic inches, this figure became the exact value of the dry gallon (4.40488377086 L).

## Differences between imperial and international

Both gallons equivalent to 8 pints, although in the United States, Panama and Puerto Rico, a pint is 16 fluid ounces ( *ounces fluid* ), while the imperial pint is equivalent to 20 fluid ounces. Thus, the US gallon equals 128 fluid ounces, while the imperial gallon equals 160. This means that the US fluid ounce measures 1.8047 cubic inches, and the imperial one measures 1.7339 cubic inches. Thus, the US fluid ounce is greater than the imperial one, although the US gallon is smaller. However, both are currently used as universal measures.

## Gallon of British beer

Used to measure the volume contained in beer container. It is still used in the United Kingdom and equals 282 cubic inches, in other figures, *4.621152048 liters*.

## Gallon in Central America

Gallon is a measure used in chemicals, paints and solvents, with a volume of 3,78541 liters (1 USgal).

- 1 Gallon (US, Fluid) = 128 Ounces (US, Fluid)
- 1 Gallon (UK, Fluid) = 160 Ounces (UK, Fluid)

## Gallons to ounces conversion tables

Following 2 table of conversions will help you to see how many fluid ounces there are in a gallon – using US and one using UK measurements.

Gallons (US) | Ounces (US) | Liters |
---|---|---|

1 | 128 | 3.785 |

2 | 256 | 7.571 |

3 | 384 | 11.356 |

4 | 512 | 15.142 |

5 | 640 | 18.927 |

6 | 768 | 22.712 |

7 | 896 | 26.498 |

8 | 1024 | 30.283 |

9 | 1152 | 34.069 |

10 | 1280 | 37.854 |

11 | 1408 | 41.64 |

12 | 1536 | 45.425 |

13 | 1664 | 49.21 |

14 | 1792 | 52.996 |

15 | 1920 | 56.781 |

Gallons (UK) | Ounces (UK) | Litres |
---|---|---|

1 | 160 | 4.546 |

2 | 320 | 9.092 |

3 | 480 | 13.638 |

4 | 640 | 18.184 |

5 | 800 | 22.73 |

6 | 960 | 27.277 |

7 | 1120 | 31.823 |

8 | 1280 | 36.369 |

9 | 1440 | 40.915 |

10 | 1600 | 45.461 |

11 | 1760 | 50.007 |

12 | 1920 | 54.553 |

13 | 2080 | 59.099 |

14 | 2240 | 63.645 |

15 | 2400 | 68.191 |