Gallons to Ounces Conversion Calculator

Enter the volume in gallons below to calculate the weight in ounces.

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1 gal = 133.52647123233 oz

Do you want to convert ounces to gallons?

How to Convert Gallons to Ounces

To convert a gallon measurement to an ounce measurement, multiply the volume by 133.526471 times the density of the ingredient or material.

You can use this simple formula to convert:

ounces = gallons × 133.526471 × ingredient density

Thus, the volume in ounces is equal to the gallons multiplied by 133.526471 times the density of the ingredient or material.

For example, here's how to convert 5 gallons to ounces for an ingredient with a density of 0.7 g/mL.
5 gal = 5 × 133.526471 × 0.7 = 467.342649 oz

This calculator converts to ounces in weight, if you're trying to convert to a volume measurement in fluid ounces try our gallons to fluid ounces calculator.

Gallons and ounces are both commonly used to measure cooking ingredients.

For cooking applications, most chefs suggest measuring dry ingredients by weight rather than volume to improve accuracy in the measurements.[1] The density of dry ingredients can vary for a variety of reasons, such as compaction.

The best way to ensure an accurate conversion is to use a scale. When a scale is not available, a calculator like the one above is a good way to estimate the volume to weight conversion.

Keep reading to learn more about each unit of measure.

How Many Ounces are in a Gallon?

The actual weight of a gallon will vary depending on the density of the material. The table below shows how many ounces of various wet and dry ingredients are in a gallon.

Gallon measurements converted to ounces for commonly used cooking and baking ingredients.
Volume in Gallons: Weight in Ounces of:
Water Milk Cooking Oil All Purpose Flour Granulated Sugar
1/8 gal 16.69 oz 17.19 oz 14.69 oz 8.8294 oz 14.11 oz
1/4 gal 33.38 oz 34.38 oz 29.38 oz 17.66 oz 28.22 oz
1/3 gal 44.51 oz 45.84 oz 39.17 oz 23.55 oz 37.63 oz
1/2 gal 66.76 oz 68.77 oz 58.75 oz 35.32 oz 56.44 oz
2/3 gal 89.02 oz 91.69 oz 78.34 oz 47.09 oz 75.25 oz
3/4 gal 100.14 oz 103.15 oz 88.13 oz 52.98 oz 84.66 oz
1 gal 133.53 oz 137.53 oz 117.5 oz 70.64 oz 112.88 oz

What is a Gallon?

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.

Learn more about gallons.

What is an Ounce?

One ounce is a unit of mass/weight equal to 1/16 of a pound or 28.349523 grams. The common ounce should not be confused with the troy ounce, which is equal to 1/12 of a troy pound.[3]

The ounce is a US customary and imperial unit of weight. Ounces can be abbreviated as oz; for example, 1 ounce can be written as 1 oz.

Learn more about ounces.


  1. National Institute of Standards & Technology, Metric Cooking Resources,
  2. National Institute of Standards and Technology, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition,
  3. James Bucki, Troy Ounce vs. Ounce, The Spruce,

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