How much is 1 gallon in ounces

How big is 1 gallon? What is 1 gallon in ounces? 1 gal to fl oz conversion.

1 Gallon =

128 Ounces

(exact result)

Display result as

A U.S. gallon is a unit of volume equal to 128 U.S. fluid ounces, or about 3.785 liters. It should not be confused with the imperial gallon used in the United Kingdom.

A U.S. fluid ounce is 1/128th of a U.S. gallon. It is not the same as an ounce of weight or an Imperial fluid ounce.

Gallons to Ounces Conversions

(some results rounded)

galfl oz
1.00 128
1.01 129.28
1.02 130.56
1.03 131.84
1.04 133.12
1.05 134.4
1.06 135.68
1.07 136.96
1.08 138.24
1.09 139.52
1.10 140.8
1.11 142.08
1.12 143.36
1.13 144.64
1.14 145.92
1.15 147.2
1.16 148.48
1.17 149.76
1.18 151.04
1.19 152.32
1.20 153.6
1.21 154.88
1.22 156.16
1.23 157.44
1.24 158.72

galfl oz
1.25 160
1.26 161.28
1.27 162.56
1.28 163.84
1.29 165.12
1.30 166.4
1.31 167.68
1.32 168.96
1.33 170.24
1.34 171.52
1.35 172.8
1.36 174.08
1.37 175.36
1.38 176.64
1.39 177.92
1.40 179.2
1.41 180.48
1.42 181.76
1.43 183.04
1.44 184.32
1.45 185.6
1.46 186.88
1.47 188.16
1.48 189.44
1.49 190.72

galfl oz
1.50 192
1.51 193.28
1.52 194.56
1.53 195.84
1.54 197.12
1.55 198.4
1.56 199.68
1.57 200.96
1.58 202.24
1.59 203.52
1.60 204.8
1.61 206.08
1.62 207.36
1.63 208.64
1.64 209.92
1.65 211.2
1.66 212.48
1.67 213.76
1.68 215.04
1.69 216.32
1.70 217.6
1.71 218.88
1.72 220.16
1.73 221.44
1.74 222.72

galfl oz
1.75 224
1.76 225.28
1.77 226.56
1.78 227.84
1.79 229.12
1.80 230.4
1.81 231.68
1.82 232.96
1.83 234.24
1.84 235.52
1.85 236.8
1.86 238.08
1.87 239.36
1.88 240.64
1.89 241.92
1.90 243.2
1.91 244.48
1.92 245.76
1.93 247.04
1.94 248.32
1.95 249.6
1.96 250.88
1.97 252.16
1.98 253.44
1.99 254.72

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!

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How much is 1 gallon in ounces
Photo by idcde from Getty Images; Canva

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.

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!

Jump to:
  • US gallon vs. Imperial gallon
  • US ounce vs. Imperial ounce
  • How many fluid ounces in a gallon
  • How to convert gallons to ounces
  • Gallons to fl oz conversion chart
  • How to convert ounces to gallons
  • Fluid ounces to gallons conversion chart
  • Free printable conversion chart
  • More baking conversions
  • Conclusion
  • FAQ

US gallon vs. Imperial 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.

The US gallon is smaller than the UK imperial gallon:

1 US liquid gallon = 3.785 liters.

1 UK gallon = 4.546 litres.

US ounce vs. Imperial 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).

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

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 calculated further. All conversions below are in US fluid measures.

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.

GallonsFluid ouncesGallonsFluid ounces
¼ gal 32 fl oz 11 gal 1408 fl oz
½ gal 64 fl oz 12 gal 1536 fl oz
¾ gal 96 fl oz 13 gal 1664 fl oz
1 gal 128 fl oz 14 gal 1792 fl oz
2 gal 256 fl oz 15 gal 1920 fl oz
3 gal 384 fl oz 16 gal 2048 fl oz
4 gal 512 fl oz 17 gal 2176 fl oz
5 gal 640 fl oz 18 gal 2304 fl oz
6 gal 768 fl oz 19 gal 2432 fl oz
7 gal 896 fl oz 20 gal 2560 fl oz
8 gal 1024 fl oz 30 gal 3840 fl oz
9 gal 1152 fl oz 40 gal 5120 fl oz
10 gal 1280 fl oz 50 gal 6400 fl oz
US gallon conversion table

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

GallonsFluid ouncesGallonsFluid 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
Imperial gallon conversion table

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

Fluid ounces to gallons 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 ouncesGallonsFluid ouncesGallons
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 1,000 fl oz 7.8125 gal
Fl oz to gal conversion table

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.

How much is 1 gallon in ounces

Download this handy Kitchen Conversion Chart >> 

More baking conversions

Be sure to also check out other baking conversions:

  • 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 love 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.

If you ever need to learn baking basics or give your baking a lift, sign up for a Baking Basics E-course

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.

How many ounces is a gallon of milk?

There are 128 US fluid ounces in a gallon of milk and 160 UK fluid ounces in a British gallon of milk.

How many ounces 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.

Is 1 gallon the same as 64 oz?

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

How many 16 oz in a gallon

16 fluid ounces make ⅛ gallon.

How many 16.9 oz in a gallon

16.9 fluid ounces equal to 0.13 gallons.

How many 32 oz make a gallon?

32 ounces equal to ¼ 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.

Is 64 oz the same as 1 gallon?

The 64 oz to gallon conversion equals a half gallon.

Is 128 oz the same as 1 gallon?

In the US there are 128 ounces to a gallon. In the UK, there are 160 ounces to a gallon.

How many total ounces are in 1 gallon?

Fluid Ounces to Gallons Chart.

How many 8 oz makes a gallon?

It takes sixteen 8-ounce glasses to make a gallon. 8 fl. oz. x 16 = 128 fl.