How many ounces in a gallon?

How many ounces in a gallon?

What are Gallons?

There are different types of gallons: US liquid, US aggregate and US British.

US Gallons (Liquid) American measure of capacity (for liquids) equivalent to 4 quarts or 3.785 liters. 

What are Ounces?

The ounce is a unit of mass used in British measurement systems and derivatives equal to approximately 28.3 grams. This is the most commonly used ounce. There are two different types of ounces: American and British. When the type of ounce is not specified, we generally speak of the avoirdupois ounce. It is also used in cookbooks and dry bulk sales in the United States.

Formula to calculate ounces to gallons

There are 128 fluid ounces in a one liquid gallon. 1 gallon water contains 160 ounces. 


If you were given gallons, you can calculate ounces simply by multiplying with 128. And if you were given a quantity in terms of ounces, you can find gallons by dividing the quantity in ounces by number 128. 


There are 4 quarts in a gallon. 2 pints in a quart and 16 ounces in a pint. This makes 1 ounce equal to 1/128 US gallon. To overcome the effects of expansion and contraction with temperature when using a gallon to specify an amount of material for commercial purposes. It is common to set the temperature at which the material will occupy the specified volume.

There are two fluid ounces in a tablespoon. Multiply the number of tablespoons by two to determine how many ounces you have. For example, 18 tablespoons equals 36 fluid ounces of water (18 tablespoons x 2 = 36 fluid ounces). 

How many ounces in a half gallon of liquid?

If one gallon is equal to 128 fluid ounces, a half gallon consists of half of 128 that is equal to 64 ounces.

Note: fluid ounces are the measure of the volume of a liquid…


After reading the above article, you might understand  the answer to this question, “How many ounces in a gallon?” 

Next look at the exact answer to this question:

  • 1 gallon water is equal to 128 fluid ounces and half of it contains 64 fluid ounces.

Visitors Also Read: How Many Ounces In A Water Bottle?

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