Gallons to Fluid Ounces Conversion

Enter the beer volume in gallons below to get the value converted to fluid ounces.

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Results in Fluid Ounces:
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1 gallon = 128 fl oz

How to Convert Gallons to Fluid Ounces

To convert a gallon measurement to a fluid ounce measurement, multiply the beer volume by the conversion ratio. One gallon is equal to 128 fluid ounces, so use this simple formula to convert:

fluid ounces = gallons × 128

The beer volume in fluid ounces is equal to the gallons multiplied by 128.

For example, here's how to convert 5 gallons to fluid ounces using the formula above.
5 gallons = (5 × 128) = 640 fl oz

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

Gallons

The US gallon is a standard size equivalent to 128 fl. oz. of beer.

The gallon is a US customary unit of beer volume.

Fluid Ounces

In the US, beer is often measured by the fluid ounce, which is the basis for other units of beer volume measure. The standard US bottle of beer contains 12 fluid ounces.

The fluid ounce is a US customary unit of beer volume. Fluid ounces can be abbreviated as fl oz, for example 1 fluid ounce can be written as 1 fl oz.

Gallon to Fluid Ounce Conversion Table

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