To convert a gallon measurement to a fluid ounce measurement, multiply the volume by the conversion ratio.

Since one gallon is equal to 128 fluid ounces, you can use this simple formula to convert:

How Many Fluid Ounces are in a Gallon?

There are 128 fluid ounces in a gallon, which is why we use this value in the formula above.

1 gal = 128 fl oz

Gallons and fluid ounces are both units used to measure volume. Keep reading to learn more about each unit of measure.

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The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups.<1> The US liquid gallon should not be confused with the US dry gallon or the imperial gallon, which are different units of measure.

The gallon is a US customary unit of volume. Gallons can be abbreviated as gal; for example, 1 gallon can be written as 1 gal.

Fluid Ounces

The US fluid ounce is a unit of volume equal to 1/16 of a pint or 1/8 of a cup. The fluid ounce is sometimes referred to as an "ounce" but should not be confused with the unit of mass. One fluid ounce is equal to just under 29.6 milliliters, but in nutrition labeling, one fluid ounce is rounded to exactly 30 milliliters.<2>

The fluid ounce is a US customary unit of volume. Fluid ounces can be abbreviated as fl oz, and are also sometimes abbreviated as fl. oz.

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or oz. fl.. For example, 1 fluid ounce can be written as 1 fl oz, 1 fl. oz., or 1 oz. fl..

Gallon to Fluid Ounce Conversion Table

Gallon measurements converted to fluid ouncens Gallonns Fluid Ouncens
1 gal 128 fl oz
2 gal 256 fl oz
3 gal 384 fl oz
4 gal 512 fl oz
5 gal 640 fl oz
6 gal 768 fl oz
7 gal 896 fl oz
8 gal 1,024 fl oz
9 gal 1,152 fl oz
10 gal 1,280 fl oz
11 gal 1,408 fl oz
12 gal 1,536 fl oz
13 gal 1,664 fl oz
14 gal 1,792 fl oz
15 gal 1,920 fl oz
16 gal 2,048 fl oz
17 gal 2,176 fl oz
18 gal 2,304 fl oz
19 gal 2,432 fl oz
20 gal 2,560 fl oz
21 gal 2,688 fl oz
22 gal 2,816 fl oz
23 gal 2,944 fl oz
24 gal 3,072 fl oz
25 gal 3,200 fl oz
26 gal 3,328 fl oz
27 gal 3,456 fl oz
28 gal 3,584 fl oz
29 gal 3,712 fl oz
30 gal 3,840 fl oz
31 gal 3,968 fl oz
32 gal 4,096 fl oz
33 gal 4,224 fl oz
34 gal 4,352 fl oz
35 gal 4,480 fl oz
36 gal 4,608 fl oz
37 gal 4,736 fl oz
38 gal 4,864 fl oz
39 gal 4,992 fl oz
40 gal 5,120 fl oz


National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, Food & Drug Administration, Guidance for Industry: Guidelines for Determining Metric Equivalents of Household Measures,