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How Many Ounces In A Gallon

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Knowing how many Fluid Ounces are in a Gallon can be very useful as the imperial units of measurement for volume are, unlike the metric system, not decimal!

Table of contents

What’s A Gallon?

A Gallon is an imperial unit of measure commonly used in the United States and several countries of the Commonwealth.

However, like many other imperial units, there are regional variations in how much volume a gallon contains.

  • 1 US Gallon contains 3.785 Liters
  • 1 Imperial Gallon contains 4.546 Liters
  • 1 US Dry Gallon contains 4.404 Liters

However, the definition of a Gallon is common among all users of the unit.

One Gallon equals 8 Pints or 4 Quarts.

It also amounts to 231 cubic inches.

What’s A Fluid Ounce?

A Fluid Ounce, also abbreviated as fl oz, fl. oz. is similarly used in some of the Commonwealth Countries and in the United States.

Its definition varies:

  • 1 Imperial Fluid Ounce is 1/20 of an Imperial Pint or 28.41 mL
  • 1 US Fluid Ounce is 1/16 of a US Liquid Pint or 29.57 mL

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More Conversion Tools

Converting US Gallons To US Ounces

The conversion between a US Gallon and a US Ounce is relatively easy as a US Gallon contains 128 Ounces.

US GallonsUS Fluid Ounces
1 Gallon128 Fluid Ounces
1/2 Gallon64 Fluid Ounces
1/3 Gallon42 Fluid Ounces + 4 Teaspoons
1/4 Gallon32 Fluid Ounces
1/8 Gallon16 Fluid Ounces
1/16 Gallon8 Fluid Ounces
1/32 Gallon4 Fluid Ounces
1/64 Gallon2 Fluid Ounces
1/128 Gallon1 Fluid Ounce

Converting Imperial Gallons To Imperial Ounces

Similarly to converting US Gallons, Imperial Gallons obey a simple rule. One Imperial Gallon contains 160 Imperial Fluid Ounces.

Imperial GallonsImperial Fluid Ounces
1 Gallon160 Fluid Ounces
1/2 Gallon80 Fluid Ounces
1/3 Gallon53 Fluid Ounces + 1.5 Teaspoons
1/4 Gallon40 Fluid Ounces
1/8 Gallon20 Fluid Ounces
1/16 Gallon10 Fluid Ounces
1/32 Gallon5 Fluid Ounces
1/64 Gallon2.5 Fluid Ounces
1/128 Gallon1.25 Fluid Ounce

Frequently Asked Questions

Is 1 gallon the same as 64 oz?

No, one US Gallon contains 128 fluid ounces.

How many 8 oz are in a gallon?

There are 16 times 8 fl oz in one US Gallon.
In the English Imperial Unit system, there are 20 times 8 Imperial Fluid Ounces per Imperial Gallon.

How many 16oz are in a gallon?

There are 8 times 16 oz in a US Gallon.

How much means 1 gallon?

1 US Gallon means 128 US Fluid Ounces or 3.785 Liters.
1 Imperial Gallon means 160 Imperial Fluid Ounces or 4.546 Liters

What is a gallon of water in Litres?

One US Gallon contains approximately 3.785 Liters.
One Imperial Gallon contains 4.546 Liters.

How many 64 oz does it take to make a gallon?

You can fit 64 fluid ounces twice in a gallon.

Carine Claudepierre

About The Author

Carine Claudepierre

Hi, I'm Carine, the food blogger, author, recipe developer, published author of a cookbook and many ebooks, and founder of Sweet As Honey.

I have an Accredited Certificate in Nutrition and Wellness obtained in 2014 from Well College Global (formerly Cadence Health). I'm passionate about sharing all my easy and tasty recipes that are both delicious and healthy. My expertise in the field comes from my background in chemistry and years of following a keto low-carb diet. But I'm also well versed in vegetarian and vegan cooking since my husband is vegan.

I now eat a more balanced diet where I alternate between keto and a Mediterranean Diet

Cooking and Baking is my true passion. In fact, I only share a small portion of my recipes on Sweet As Honey. Most of them are eaten by my husband and my two kids before I have time to take any pictures!

All my recipes are at least triple tested to make sure they work and I take pride in keeping them as accurate as possible.

Browse all my recipes with my Recipe Index.

I hope that you too find the recipes you love on Sweet As Honey!

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