How many ounces in a gallon? There are 128 ounces in a gallon. Please note that this is talking about how many fl oz in a gallon, not ounces of weight. One gallon also equals 4 quarts, 8 pints, or 16 cups. Get a helpful conversion table to convert ounces - gallons. You’ll love how easy it makes figuring out how many ounces are in a gallon of water, honey, milk, and more!
What is a gallon? What is an ounce? Both gallons and ounces are units of volume in United States customary units and the British Imperial system.
Here is a kitchen conversion chart for converting 1 gal to oz:
| Unit of Measurement | US Fluid Ounces (Fl oz) | Imperial Fluid Ounces | Liters (litres) |
|---|---|---|---|
| 1 US Liquid Gallon (customary) | 128 | 133.228 | 3.78541 |
| 1 US Dry Gallon (customary) | 148.947 | 155.0301 | 4.40488 |
| 1 Imperial UK Gallon (international) | 153.722 | 160 | 4.54609 |
US Customary Unit conversions (AKA US Customary System or USCS) are what we commonly use for home baking and cooking in America. When talking about how many fluid ounces in a gallon in this article, I’ll mostly be referring to US liquid measurements.
The United Kingdom, Canada, and the rest of the world are more likely to use liters instead of British imperial units. It would be nice to see the US join the rest of the world someday in using the metric system. Until then, it can be helpful to know the gallon conversion if you’re trying to follow American recipes, since they’re different than UK fluid measures.
How many ounces of water should I drink in a day?
One more reason you might want to know how many fl oz in a gallon is if you’re following recommended daily water intakes. These guidelines vary depending on the source. Here’s what the National Academy of Medicine recommends for daily fluid intake (source):
- Men: 13 cups; 104 ounces; 0.8125 gallons (3.076 Liters)
- Women: 9 cups; 72 ounces; 0.5625 gallons (2.129 Liters)
Keep in mind that these are general recommendations. How much water you should drink may vary based on a variety of individual factors, including:
- Physical activity level
- Body size
- Exposure to extreme climates
- Illness (fever, vomiting, etc. may increase fluid needs)
- Alcohol use
- Use of certain medications (particularly diuretics)
- Whether the person is pregnant or breastfeeding
Jump to:
How many ounces in a gallon?
To figure out how many oz in a gallon, you can use a simple conversion formula for general conversions. We know:
1 gallon = 128 fluid ounces
Therefore, here is our conversion ratio:
(X gallons)*128 = Y ounces
Or
Number of gallons = (Number of ounces)/128
So, to figure out one oz - gallon, we can fill in the mathematical formula:
Number of gallons = (1 ounce)/128
0.0078125 gallon = 1 ounce
In other words, one gallon equals 128 fl ounces. One ounce equals 0.0078125 gallon, or 1/128 gallon of liquid.
Ounces in a Gallon Chart
Here’s a gallons to ounces conversion table, using US customary gallons and fluid ounces:
| Gallons (gal) | Fluid Ounces (fl oz) |
|---|---|
| ¼ | 32 |
| ½ | 64 |
| ¾ | 96 |
| 1 | 128 |
| 2 | 256 |
| 3 | 384 |
| 4 | 512 |
| 5 | 640 |
| 6 | 768 |
| 7 | 896 |
| 8 | 1024 |
| 9 | 1152 |
| 10 | 1280 |
| 11 | 1408 |
| 12 | 1536 |
| 13 | 1664 |
| 14 | 1792 |
| 15 | 1920 |
| 16 | 2048 |
| 17 | 2176 |
| 18 | 2304 |
| 19 | 2432 |
| 20 | 2560 |
| 21 | 2688 |
Here’s a UK Imperial Gallons to Imperial Fluid Ounces conversion chart:
| Imperial Gallons | Imperial Fluid Ounces |
|---|---|
| ¼ | 40 |
| ½ | 80 |
| ¾ | 120 |
| 1 | 160 |
| 2 | 320 |
| 3 | 480 |
| 4 | 640 |
| 5 | 800 |
| 6 | 960 |
| 7 | 1120 |
| 8 | 1280 |
| 9 | 1440 |
| 10 | 1600 |
| 11 | 1760 |
| 12 | 1920 |
| 13 | 2080 |
| 14 | 2240 |
| 15 | 2400 |
| 16 | 2560 |
| 17 | 2720 |
| 18 | 2880 |
| 19 | 3040 |
| 20 | 3200 |
| 21 | 3360 |
Half Gallon – Ounces Conversion
For half gallon to ounces conversions, we use the formula:
(number of gallons)*128 = number of ounces
Or
(0.5 gallons)*128 = 64 ounces
In other words, a half gallon contains 64 fluid ounces.
How many ounces in a half gallon?
As just mentioned, 64 ounces equals a half gallon.
Is 64 oz the same as 1 gallon?
No, 64 oz is the same as ½ gallon. 128 oz is the same as one gallon.
Is 32 oz half a gallon?
No, 32 oz equals one quarter gallon (¼ gallon). 64 ounces is a half gallon in US customary units.
How many liters in a gallon?
There are approximately 3.78541 liters in a gallon.
How many ounces in a liter?
There are approximately 33.814 ounces in a liter.
How many ounces in a cup?
There are 8 ounces in a cup. (To be more specific, there are 8 fluid ounces in one US customary cup.)
How many ounces in a quart?
There are 32 ounces in a quart. (To be more specific, there are 32 fluid ounces in one US fluid quart.)
How many cups in a gallon?
There are 16 cups in a gallon. (To be more specific, there are 16 US customary cups in one US gallon.)
How many ml in a gallon?
There are approximately 3785.41 milliliters in one US fluid gallon.
How many ounces in a pound?
There are 16 ounces in a pound, or 0.45 kilograms (kg). Please note that we are talking about ounces as a unit of weight here, not a unit of volume.
How many gallons is 50 ounces?
50 ounces equals approximately 0.390625 gallon.
96 oz equals how many gallons?
96 ounces equals 0.75 gallon, or ¾ gallon.
How many ounces is 1.5 gallons?
1.5 gallons equals 192 ounces. (To be more specific, there are 192 fluid ounces in 1.5 USA customary gallons.)
How many ounces is 2 gallons?
There are 256 ounces in 2 gallons.
How many oz is 3 gallons?
There are 384 ounces in 3 gallons.
How many oz in 4 gallons?
There are 512 ounces in 4 gallons.
How many ounces in 5 gallons?
There are 640 ounces in 5 gallons.
How many ounces in a 55 gallon drum?
There are 7040 fluid ounces in a 55 gallon drum.
How many ounces in a gallon of water?
Water has 128 ounces per gallon, the same as other volume measured liquids.
Water Bottle Sizes Conversions
How many oz is a gallon of water? Here is an ounces – gallons – liters conversion table for common water bottle sizes:
| Ounces (oz) | Gallons (gal) | Liters (L) |
|---|---|---|
| 6 | 0.046875 | 0.177441 |
| 8 | 0.0625 | 0.236588 |
| 16 | 0.125 | 0.473176 |
| 16.9 | 0.1320312 | 0.4997926 |
| 24 | 0.1875 | 0.709765 |
| 32 | 0.25 | 0.946353 |
| 64 | 0.5 | 1.89271 |
How many 8 ounce glasses does it take to make a gallon?
It takes 16 eight ounce glasses to make one gallon.
How many gallons is 8 glasses?
Does 8 glasses of water equal a gallon? No, 8 8-ounce glasses is ½ gallon. (On the other hand, if your glasses are 16 ounces each, 8 of them would equal one gallon.)
How many fluid ounces is 8 glasses of water?
If the glasses of water are 8 ounces each, 8 of them equals 64 fluid ounces. If the glasses of water are 16 ounces each, 8 of them equals 128 fluid ounces, or one gallon.
How many 16 oz bottles make up a gallon of water?
It takes 8 16-oz bottles to make one gallon of water. It takes 4 16-ounce bottles to make a half gallon of water.
How many 6 oz glasses are in a gallon?
There are 21.333 six ounce glasses in one gallon. In other words, there are 21 ⅓ six oz glasses per gallon.
How many 16.9 oz in a gallon?
There are approximately 7.574 16.9-oz bottles in a gallon.
FAQs
There are 128 ounces in one gallon of milk. Please note this is the liquid measure of volume. One gallon of milk weighs approximately 8.6 lbs, or 137.6 ounces of weight.
There are 128 ounces per gallon of gasoline. One gallon of gas weighs about 6 pounds, or 96 ounces of weight. The exact weight measurement depends on the type of gas and additives it contains.
There are 128 oz per gallon of paint in liquid volume. Paint weighs 6-12 lbs. Per gallon, meaning the ounces in weight can vary significantly.
There are 128 fluid ounces in a gallon of ice cream. Ice cream weighs about 5 lbs per gallon, or 80 ounces in weight measure.
There are 128 fluid ounces in a gallon of honey. Honey weighs about 12 pounds per gallon, or 192 ounces in weight measure.
There are 128 fl ounces in one gallon of baked beans. The exact weight in ounces depends on the recipe.
A gallon Ziplock bag can contain 128 fl oz.
Canada uses the metric system, and typically measures gas and liquids like milk in liters instead of gallons. If they’re using the Imperial system, there are 160 Imperial fluid oz in 1 Imperial gallon.
More Measurement Conversions
Here are some other articles to help you with baking and cooking measurements:
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