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Example How Many OZ in a Gallon

Units of Measure / How Many OZ in a Gallon

But this answer is correct only if you mean US liquid gallons and US fluid ounces. And there are some other definitions of these units, so you should know the most important of them in order not to get confused.

First of all, you should understand that now we are talking about fluid ounces which are units of volume. The US fluid ounce equals to about 29.6 milliliters, and the imperial fluid ounce equals to about 28.4 milliliters.

And the number of ounces in a gallon is different in the imperial and the US systems:

- One US gallon has 128 US fluid ounces
- One imperial gallon has 160 imperial fluid ounces

It is not difficult to remember. But what should you do, if you need to know how many imperial ounces there are in some number of US gallons? Such calculations will be too complex for most people. You can consult our table that we have composed to help you. If necessary, use a calculator.

One US liquid gallon

One imperial gallon

US fluid ounces

128

153.72

Imperial fluid ounces

133.23

160

Liters

3.78

4.54

So, if you want to calculate how many US fluid ounces are in five imperial gallons, you must multiply 153.72 (154 for rough estimation) by 5.

- The gallon is a non-metric liquid measurement unit accepted in many countries. The US liquid gallon (about 3.785 liters) and the imperial gallon (about 4.54 liters) are the most common definitions of this unit. The US gallon consists of 128 US fluid ounces, and the imperial gallon consists of 160 imperial fluid ounces.
- The Ounce (abbr. oz) is a widely-spread non-metric unit of mass or volume (fluid ounce), which is used in various systems and has several definitions. The US fluid ounce equals to about 29.6 milliliters, and the imperial fluid ounce equals to about 28.4 milliliters.

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