How Many Ounces In A Gallon
By Carine Claudepierre
Published on 09/01/2022 - Last updated on 11/19/2023
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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!
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
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 Gallons | US Fluid Ounces |
|---|---|
| 1 Gallon | 128 Fluid Ounces |
| 1/2 Gallon | 64 Fluid Ounces |
| 1/3 Gallon | 42 Fluid Ounces + 4 Teaspoons |
| 1/4 Gallon | 32 Fluid Ounces |
| 1/8 Gallon | 16 Fluid Ounces |
| 1/16 Gallon | 8 Fluid Ounces |
| 1/32 Gallon | 4 Fluid Ounces |
| 1/64 Gallon | 2 Fluid Ounces |
| 1/128 Gallon | 1 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 Gallons | Imperial Fluid Ounces |
|---|---|
| 1 Gallon | 160 Fluid Ounces |
| 1/2 Gallon | 80 Fluid Ounces |
| 1/3 Gallon | 53 Fluid Ounces + 1.5 Teaspoons |
| 1/4 Gallon | 40 Fluid Ounces |
| 1/8 Gallon | 20 Fluid Ounces |
| 1/16 Gallon | 10 Fluid Ounces |
| 1/32 Gallon | 5 Fluid Ounces |
| 1/64 Gallon | 2.5 Fluid Ounces |
| 1/128 Gallon | 1.25 Fluid Ounce |
Frequently Asked Questions
No, one US Gallon contains 128 fluid ounces.
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.
There are 8 times 16 oz in a US 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
One US Gallon contains approximately 3.785 Liters.
One Imperial Gallon contains 4.546 Liters.
You can fit 64 fluid ounces twice in a gallon.
About The Author
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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