How Many Ounces in a Gallon: Ounces in Half Gallon

What is the volume of a gallon of water? A gallon contains 128 ounces. One liter of water has a volume of 160 fluid ounces. How about a half-gallon? There is a volume of 64 fluid ounces. There are 128 fluid ounces in a gallon and 64 fluid ounces in a half gallon

Imperial measurement system in U.S and U.K

In the United States, one variation of the Imperial system was used. These were probably the most popular due to technological advancement, economic growth, and population growth.

The metric system did not become widely adopted until much later in its implementation and nowadays, the metric system is being used in most of the world, as the world has become a global village, and for ease of business, people use standard units to avoid misunderstanding and hurdles.

In some cases, we see that British and Americans use their own system since it has become part of their tradition, making it difficult for their people to switch to the new metric system.


  • 1 gallon equals 3.7885 liters.
  • 1 Liter equals 33.814 ounces
  • One fl gal equals 3.785 x 33.814 = 128 oz


  • The imperial gallon is equal to 4.54609 liters
  • 1 Liters = 35.1951 UK fl o
  • 160 ounces = 4.54609 x 35.1951 = 1 fluid Gallon

Ounces to gallon conversion

There was a long debate on the ounce to gallon conversion before it was standardized. Currently, there are 2 different measurements systems being used around the world.  The imperial British measurement system is one, while the US measurement system is another. They differ in a few ways, as shown above.

Fluid Ounce to Gallon Conversion Table

In the table, the exact measurement of U.S. gallon and Imperial gallon in a fluid is given.

Fluid ounce U.S Liquid Gallon Imperial Gallon

Fluid ounce U.S Liquid Gallon Imperial Gallon
1 0.00750594 0.00625
2 0.0150119 0.0125
3 0.0225178 0.01875
4 0.0300237 0.025
5 0.0375297 0.03125
6 0.0450356 0.0375
7 0.0525416 0.04375
8 0.0600475 0.05
9 0.0675534 0.05625
10 0.0750594 0.0625
20 0.150119 0.125
30 0.225178 0.1875
40 0.300237 0.25
50 0.375297 0.3125
60 0.450356 0.375
70 0.525416 0.4375
80 0.600475 0.5
90 0.675534 0.5625
100 0.750594 0.625

What is the volume of water in a gallon a day?

According to the Mayo Clinic 2, an average healthy person should drink eight standard glasses of water per day. One standard glass of water equals 8 oz and one gallon equals 160 oz.

How many 16.9 oz in a gallon

Is there exactly one US gallon in 7.57 bottles of 16.9 ounces? It is a very complex question but its answer is quite simple. One US gallon is equal to 7.57 bottles of 16.9 ounces of water.  There are 7.57 water bottles equal to a gallon according to the US measurement system. The imperial measurement system and international metric measurement system are quite different. The answer to what is 16.9 oz of water equals a gallon is also the same.

How many ounces in a half-gallon of water?

What is the weight of a half-gallon of water? The answer is 64 fluid oz per half a gallon of water. The weight of a gallon of water is 128 fluid ounces.

Additionally, 160 Imperial liquid oz equal 1 Imperial gallon. An Imperial gallon is larger than an American gallon.

  • 1 U.S cup equal  to the 8 oz
  • 8 cups equal 64 oz or a half-gallon
  • 16 cups are equivalent to 128 fl oz, which is actually equal to 1 gallon

How Many Ounces in a Gallon-Conclusion

How Many Ounces in a Gallon 3 of Water and How Many Ounces in a Half Gallon is quite clear now

The exact answer is:

There is 128 U.S. fluid oz in a gallon of water and 64 U.S. fluid oz in a half-gallon of water.

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