Before we start the detailing about how many ounces are in a gallon, First let us know about what is Ounce and gallon

What is the ounces?

Oz is the majority of ounces, a unit of measurement

The ounce (abbreviated oz) is a unit of mass, weight, or volume used in most British derived customary systems of measurement. The Ounce approximately 28.3 g is ​116 of a standard avoirdupois pound; this is the United States customary and British imperial ounce. It is firstly used in the United States to measure packaged foods and food portions, postal items, the areal density of fabric and paper, boxing gloves, and so on, but sometimes also elsewhere in the Anglosphere.

Ounces Measure Weight

Ounces are a unit used to measure weight. This measurement is most often used with dry ingredients, like flour or sugar, but can also apply for things like honey or yogurt. When a recipe calls for ounces, it’s referring to a specific weight. You may notice baking recipes written in ounces instead of cups — this is because measuring ingredients by weight proves to be more accurate. The best way to measure ounces is by using a scale.

Fluid Ounces Measure Volume

Fluid ounces are a unit used to measure volume, or how much space something takes up. This measurement is also used for liquid ingredients, like water or milk. When a recipe calls for fluid ounces, go ahead and pull out your measuring cup; it’s the most accurate way to measure this.

A gallon is a unit of volume of the traditional imperial measurement system and the United States. The gallon is of one type in the imperial system and 2 kinds (fluid and dry) in the usual US measurement system. UU. 1 gallon of US liquid UU. It defines as 231 cubic inches, 1 US gallon. UU. Dry is 268.8 cubic inches and 1 imperial gallon of 277.4 cubic inches. The abbreviation is “gal.”

Symbol of ounce

Fluid Ounce

In the United States, the U.S. fluid ounce is a unit of liquid capacity, approximately 29.5735 milliliters.  Symbol, fl oz.

In the British imperial measure, an imperial fluid ounce is a unit of capacity, approximately 28.413 milliliters.  Symbol, fl oz. A symbol used in a pharmacy, . It is the volume of 1 avoirdupois ounce of water at 62° F.

One U.S. fluid ounce is 1.041 imperial fluid ounces.

Among other roles, the imperial fluid ounce figured in British apothecaries’ measure.

What is the gallon?

Gallon is an imperial and United States customary measurement system volume unit. One us fluid gallon  =  128 us fluid ounces and one gallon is = 160 imperial fluid ounce


How Many Ounces in a Gallon?

Ounces to Gallons conversion tables

Ounces to Gallons conversion tables 

Gallons to Ounces to Liters Conversion Tables


Gallon to ounce to Liter conversion tables

Fluid Ounce

It is abbreviated fl ozfl. oz. or oz. Fl. Old forms are  ℥, fl ℥, f℥, ƒ ℥ is a unit of capacity typically used for measuring liquids. Various definitions have used in the whole history, but only two are still in common used: the British Empire and the United States customary fluid ounce.

Fluid Ounce

The imperial fluid ounce is ​120 of the imperial pint, ​1160 of the imperial gallon, or around   28.41ml

The US fluid ounce is ​116 of a fluid pint and ​1128 of a liquid gallon and approx 29.57 ml, making it about 4% larger than the imperial fluid ounce.

Ones it clear from the ounce as a unit of weight or mass, although it is sometimes referring to only as an “ounce” where the context makes the meaning clear, such as ounces in a bottle.

Definitions and Equivalences

Imperial fluid ounce

1 imperial fluid ounce = 1160 imperial gallon
= 140 imperial quart
= 120 imperial pint
= 110 imperial cup
= 15 imperial gill
= 8 imperial fluid drams
= 28.4130625 milliliters
1.733871455 (C.I) cubic inches
0.960759940 US fluid ounces(F.O)
the volume of one avoirdupois ounce of water

US fluid ounce

1 US fluid ounce = 1128 US gallon
= 132 US quart
= 116 US pint
= 18 US cup
= 14 US gill
= 2 US tablespoons
= 6 US teaspoons
= 8 US fluid drams
= 1.8046875 cubic inches
= 29.5735295625 millilitres
1.040842731 Imperial fluid ounces


30 milliliters 1.055852392 Imperial fluid ounces
1.014420681 US customary fluid ounces
1.830712323 Cubic inches

US customary fluid ounce

United State food labeling fluid ounce

For providing sizes of nutrition labels in the US, regulation 21 CFR §101.9(b) requires the use of “common measures of households,” and 21 CFR §101.9(b)(5)(viii) defines a “standard household measures ” fluid ounce as exactly 30 milliliters.