Don't wonder anymore about how many oz in a gallon. Here is a handy guide on how to convert fluid oz to a gallon or gallons to ounces. Also, enjoy a FREE conversion chart!

Wouldn't you agree that all these units of measurement, like an imperial pint, US liquid quart, dry gallon, liquid cup, weight ounce, etc., in the recipes, make you dizzy?

I know that all the different measurements can be really confusing sometimes.

Conversions are never easy. But it is especially difficult when trying to convert between two different measurement systems.

## Jump to:

- What is a gallon?
- US gallon vs. Imperial gallon
- What is a fluid ounce?
- US ounce vs. Imperial ounce
- How many fluid ounces in a gallon
- How to convert gallons to ounces
- Gallons to fl oz conversion chart
- Fraction of gallon to ounces conversion chart
- How to convert ounces to gallons
- Ounce to gallon conversion chart
- Other gallon volume conversions
- How many ounces in a gallon of milk
- How many ounces in a gallon of ice cream
- Free printable conversion chart
- Related conversions
- Conclusion
- FAQ
- Comments

For example, it is the Imperial system of the United States vs. the metric system in Canada and other countries where the metric measurement system is implemented.

One of the most common questions is how many ounces of water you should drink a day. And how much is it by the gallon?

According to the Mayo Clinic website, the U.S. National Academies of Sciences, Engineering, and Medicine recommend an adequate daily water intake for healthy adults:

for men: 15.5 cups or 3.7 liters and

for women: 11.5 cups or 2.7 liters.

By converting these amounts of water into gallons, men should drink about 1 gallon of water per day and women - 0.7 gallons per day, where 1 US gallon equals 16 eight-ounce glasses of water.

But the fluid intake is more complicated because it should consider other factors. As a general rule of thumb, they are exercise, weather conditions, and overall health.

Despite seeming complications with all the water and other liquids conversions, I have done conversions for you: from ounces to cups, ounces to quarts, and ounces to pints.

Read this blog post on how many ounces in a gallon, and enjoy!

## What is a gallon?

A gallon (abbreviated as "gal") is a measure of volume used in the Imperial and US measurement systems.

The word "gallon" originates from the Latin word *"galleus"* or *"galena,"* which means container used in the past to measure wine production.

## US gallon vs. Imperial gallon

There are two known types of gallons - the US gallon and the Imperial gallon. But what is the difference?

The US gallon is smaller than the UK imperial gallon:

1 US liquid gallon = 3.785 liters or 231 cubic inches;

1 UK gallon = 4.546 litres, or 4 Imperial quarts.

## What is a fluid ounce?

An ounce is the name of several different units: a unit of weight measured in dry ounces (oz) or a unit of volume measured in fluid ounces (fl. oz. or fl oz).

## US ounce vs. Imperial ounce

The US fluid ounce is larger than the UK fluid ounce used in the Imperial measurement system:

1 US liquid oz = 29.5735 mL

1 UK liquid oz = 28.4131 mL

## How many fluid ounces in a gallon

Let's dive into how many fl oz make a gallon.

### 1 gallon to ounces (1 gal to fl. oz.)

One US gallon of liquid equals 128 US fluid ounces, or

1 gal = 128 fl. oz.

One Imperial gallon equals 160 UK fluid ounces, or

1 gal = 160 fl. oz.

### 1 ounce to a gallon (1 fl. oz. to gal)

How much is one ounce: US and British imperial ounce?

1 US fluid ounce equals 0.0078125 US gallon.

1 Imperial fluid ounce equals 0.00625 Imperial gallons.

## How to convert gallons to ounces

To convert US gallons to US fluid ounces, multiply the number of gallons by 128, where 128 is a conversion factor:

**the gal x 128.**

To convert Imperial gallons to Imperial fluid ounces, multiply the number of gallons by 160, where 160 is a conversion factor:

**the gal x 160.**

Let's have a look at an example.

### How many ounces in 2 gallons?

**2 gal x 128 = 256 fl. oz.** (US system), so

there are 256 US fluid ounces in 2 US gallons.

**2 gal x 160 = 320 fl. oz.** (Imperial system), so

there are 320 Imperial fluid ounces in 2 Imperial gallons.

Let's calculate further. All conversions below are in US fluid measures.

### How many ounces in a half gallon

There are 64 f fluid ounces in a half gallon.

### How many ounces in 3 gallons

There are 384 fluid ounces in 3 gallons.

### How many ounces in 4 gallons

There are 512 fluid ounces in 4 gallons.

### How many ounces in 5 gallons

There are 640 fluid ounces in 5 gallons.

## Gallons to fl oz conversion chart

The chart below provides an easy-to-use guide to converting US gallons to US fluid ounces.

Gallons | Fluid ounces | Gallons | Fluid ounces |
---|---|---|---|

1 gal | 128 fl oz | 13 gal | 1664 fl oz |

2 gal | 256 fl oz | 14 gal | 1792 fl oz |

3 gal | 384 fl oz | 15 gal | 1920 fl oz |

4 gal | 512 fl oz | 16 gal | 2048 fl oz |

5 gal | 640 fl oz | 17 gal | 2176 fl oz |

6 gal | 768 fl oz | 18 gal | 2304 fl oz |

7 gal | 896 fl oz | 19 gal | 2432 fl oz |

8 gal | 1024 fl oz | 20 gal | 2560 fl oz |

9 gal | 1152 fl oz | 30 gal | 3840 fl oz |

10 gal | 1280 fl oz | 40 gal | 5120 fl oz |

11 gal | 1408 fl oz | 50 gal | 6400 fl oz |

12 gal | 1536 fl oz | 100 gal | 12800 fl oz |

Here is another table to convert Imperial gallons to Imperial fluid ounces.

Gallons | Fluid ounces | Gallons | Fluid ounces |
---|---|---|---|

1 gal | 160 fl oz | 11 gal | 1760 fl oz |

2 gal | 320 fl oz | 12 gal | 1920 fl oz |

3 gal | 480 fl oz | 13 gal | 2080 fl oz |

4 gal | 640 fl oz | 14 gal | 2240 fl oz |

5 gal | 800 fl oz | 15 gal | 2400 fl oz |

6 gal | 960 fl oz | 16 gal | 2560 fl oz |

7 gal | 1120 fl oz | 17 gal | 2720 fl oz |

8 gal | 1280 fl oz | 18 gal | 2880 fl oz |

9 gal | 1440 fl oz | 19 gal | 3040 fl oz |

10 gal | 1600 fl oz | 20 gal | 3200 fl oz |

## Fraction of gallon to ounces conversion chart

This chart provides a simple guide to converting a fraction of US gallons to US fluid ounces.

In the US system, one gallon is 128 ounces, and a half-gallon is 64 ounces. In the Imperial system, there are 160 Imperial fluid ounces in a gallon and 80 Imperial fluid ounces in ½ gallon.

But how many ounces in ¾, ⅔, ⅓, ¼, and ⅛ gallon?

Fraction of gallon | Fluid ounces |
---|---|

1 gal | 128 fl oz |

¾ gal | 96 fl oz |

⅔ gal | 84 fl oz |

½ gal | 64 fl oz |

⅓ gal | 42 fl oz |

¼ gal | 32 fl oz |

⅛ gal | 16 fl oz |

## How to convert ounces to gallons

To convert US fluid ounces to US gallons, divide the number of ounces by 128, where 128 is a conversion factor:

**the oz ÷ 128.**

For example, 1 ounce to gallon calculation:

**1 oz ÷ 128 = 0.0078125 gal**

To convert Imperial fluid ounces to Imperial gallons, divide the number of ounces by 160, where 160 is a conversion factor:

**the oz ÷ 160.**

For example, 1 ounce to gallon calculation:

**1 oz ÷ 160 = 0.00625 gal**

## Ounce to gallon conversion chart

Here is a simple unit conversion chart for liquid measurements: from US fluid ounces to US gallons (fl oz to gal) for easy reference.

Fluid ounces | Gallons | Fluid ounces | Gallons |
---|---|---|---|

1 fl oz | 0.007812 gal | 20 fl oz | 0.15625 gal |

2 fl oz | 0.015625 gal | 30 fl oz | 0.234375 gal |

3 fl oz | 0.023437 gal | 40 fl oz | 0.3125 gal |

4 fl oz | 0.03125 gal | 50 fl oz | 0.390625 gal |

5 fl oz | 0.039062 gal | 60 fl oz | 0.46875 gal |

6 fl oz | 0.046875 gal | 70 fl oz | 0.546875 gal |

7 fl oz | 0.054687 gal | 80 fl oz | 0.625 gal |

8 fl oz | 0.0625 gal | 90 fl oz | 0.703125 gal |

9 fl oz | 0.070312 gal | 100 fl oz | 0.78125 gal |

10 fl oz | 0.078125 gal | 1000 fl oz | 7.8125 gal |

## Other gallon volume conversions

Here is a quick conversion chart from one gallon (1 gal) to other US volume units, otherwise specified.

Units | Number of units |
---|---|

Quarts | 4 qt. |

Pints | 8 pt. |

Cups (US) | 16 cups US |

Cups (Imperial) | 13.33 cups U. K. |

Tablespoons | 256 tbsp |

Teaspoons | 768 tsp |

Liters | 3.79 L |

Milliliters | 3785.41 mL |

## How many ounces in a gallon of milk

There are 128 US fluid ounces in a gallon of milk sold in supermarkets in the United States. In the UK, there are 160 UK fluid ounces in a British gallon of milk.

## How many ounces in a gallon of ice cream

Getting ready for a potluck or BBQ party? You will need to buy a large amount of ice cream, like a gallon, for example, that yields about 32 scoops. One scoop makes one serving of 4 ounces.

How many ounces are in a gallon of ice cream? A true gallon of ice cream consists of 128 ounces, but surprisingly, some containers are labeled as a gallon containing about 96 ounces.

## Free printable conversion chart

I am so excited to share this FREE kitchen conversion chart with you. It will help make baking more accessible and more fun.

Download this handy Kitchen Conversion Chart >>

## Related conversions

Be sure to also check out other baking conversion charts on the website:

- Grams To Cups Conversions
- Cups To Grams Conversions
- How Many Cups In A Pint
- How Many Cups In A Gallon
- How Many Milliliters In A Teaspoon
- How Many Milliliters In A Tablespoon

Also, you will fall in love with this simple tool - Cake Pan Converter - to calculate cake pan sizes.

## Conclusion

I hope this guide has brought you joy and an educational experience to help you get started in the kitchen. Or it has made another step towards becoming a better baker.

You might see other frequently asked questions about a gallon to ounces conversion, for example:

- How many oz in a gallon
- How many fluid ounces in a gallon
- How many fl oz in a gallon
- How many ounces in one gallon
- How many ounces are in 1 gallon
- How many ounces per gallon
- 1 gallon equals how many ounces

The answer is the same: 1 gallon equals 128 fluid ounces.

## FAQ

**How many ounces are in a gallon of water?**

There are 128 fluid ounces of water in a US gallon of water. In the UK, a gallon of water equals 160 fluid ounces.

**Is 1 gallon the same as 64 oz?**

No, one gallon equals 128 fluid ounces; 64 US fl. oz make ½ gallon.

**How many 8 oz bottles make a gallon?**

One gallon contains 128 ounces, so 8 eight-ounce bottles make a gallon.

**How many 16 oz in a gallon**

Eight 16 oz make a gallon.

**How many 16 oz. bottles make a gallon**

One gallon contains 128 ounces, so eight 16 oz. bottles make a gallon.

**How many 16.9 oz bottles make a gallon**

To be precise, there are 7.574 16.9 oz bottles in a gallon.

**How many 32 oz make a gallon?**

Four 32 oz make a gallon.

**How many 32 oz. bottles make a gallon?**

One gallon is 128 ounces, so four 32 oz. bottles make a gallon.

**How many ounces in a half gallon**

There are 64 fluid ounces in a half gallon.

**How many gallons do 64 ounces equal?**

½ gallon equals 64 fluid ounces.

**How many glasses of water in one gallon**

One gallon contains 128 ounces, and a standard glass contains 8 ounces. So 16 eight-ounce glasses of water make one US gallon.

**How many cups in a gallon**

One liquid measuring cup equals 8 fluid ounces, so there are sixteen cups are in a gallon.

Aly says

Thank you for this valuable information.