Fluid Ounces to Gallons Conversion

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

SWAP UNITS
Results in Gallons:
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1 fl oz = 0.007812 gal

How to Convert Fluid Ounces to Gallons

conversion scale showing fluid ounces and equivalent gallons volume values

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

gallons = fluid ounces ÷ 128

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

For example, here's how to convert 500 fluid ounces to gallons using the formula above.
500 fl oz = (500 ÷ 128) = 3.90625 gal

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

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 labelling, one fluid ounce is rounded to exactly 30 milliliters.[1]

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

Gallons

The US liquid gallon is a unit of fluid volume equal to four quarts, eight pints, or sixteen cups.[2] 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 Ounce to Gallon Conversion Table

Fluid ounce measurements converted to gallons
Fluid Ounces Gallons
1 fl oz 0.007812 gal
2 fl oz 0.015625 gal
3 fl oz 0.023437 gal
4 fl oz 0.03125 gal
5 fl oz 0.039062 gal
6 fl oz 0.046875 gal
7 fl oz 0.054687 gal
8 fl oz 0.0625 gal
9 fl oz 0.070312 gal
10 fl oz 0.078125 gal
20 fl oz 0.15625 gal
30 fl oz 0.234375 gal
40 fl oz 0.3125 gal
50 fl oz 0.390625 gal
60 fl oz 0.46875 gal
70 fl oz 0.546875 gal
80 fl oz 0.625 gal
90 fl oz 0.703125 gal
100 fl oz 0.78125 gal
200 fl oz 1.5625 gal
300 fl oz 2.3438 gal
400 fl oz 3.125 gal
500 fl oz 3.9063 gal
600 fl oz 4.6875 gal
700 fl oz 5.4688 gal
800 fl oz 6.25 gal
900 fl oz 7.0313 gal
1,000 fl oz 7.8125 gal

References

  1. U.S. Food & Drug Administration, Guidance for Industry: Guidelines for Determining Metric Equivalents of Household Measures, https://www.fda.gov/regulatory-information/search-fda-guidance-documents/guidance-industry-guidelines-determining-metric-equivalents-household-measures
  2. National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf