How many 20 oz water bottles make a gallon

You want to know how many water bottles are in a gallon. But, math is hard. And, who has time for it anyway? Maybe you want to make sure you are drinking a gallon of water every day and only have 16.9-ounce bottles. Maybe you want to make sure you get the best bang for your buck. Or, you want to choose the most sustainable packaging to reduce your plastic waste. No matter the reason, we can help. In this article, we will show you how many 16.9 oz bottles are in one, two and a half, three, and five-gallons. 

How Many Water Bottles Are in a Gallon?

A water bottle, in this context, means a single-serve size. We have chosen to use a 16.9-ounce bottle for our calculations as it is the most common option. To calculate how many 16.9 oz water bottles are in a gallon, we need to know how many ounces are in one gallon. We used a free online conversion calculator for liquid measurements to determine there are 128 ounces in one gallon. Divide 128 by 16.9, round up, and we now know that there are eight water bottles in a gallon.

How many bottles are in a gallon depends on the size of the bottle. Bottled water is sold in a variety of sizes ranging from 8 oz (236 ml) to 50.7 oz (1.5L). There is 128 oz (3.78 L) of water in a gallon. So the number of bottles you need to drink in order to make a gallon depends entirely on the bottle size. Poland Springs, Evian, Dasani, Aquafina, Fiji,, S. Pellegrino, Deer Park and Kirkland are just a few brands of water. And they all sell water in a variety of bottle sizes. The most common size being 16.9 oz. There are 7.5 bottles of 16.9 oz water in a gallon. So if you plan on drinking a gallon of water a day, you’ll need to drink 7 1/2 average size water bottles.

Water bottles comes in a variety of designs. Mini bottles are usually between 8-12 oz. The 16.9 oz bottle is the standard bottle that just about every manufacturer offers. Sports water bottles are around 20 oz and usually come with a sports cap. Sports bottles are the largest bottle size most people carry around with them. Larger water bottle sizes are typically used at home. They come in sizes as big as 50.7 oz (1.5 L).

A single serving of water is generally considered 8 oz. It’s generally recommended that every person drink at least 8 x 8 oz servings of water per day. Although many people, especially athletes, drink a gallon or more per day.

In United States, the water bottles are usually in 8 oz, 12 oz, 16.9 oz (0.5 liter), 20 oz, 24 oz and 33.8 oz (1 liter) sizes.

1 US gallon is equal to 128 fluid ounces. To find out how many water bottles there are in a gallon, divide 128 by the size of the water bottle in fluid ounces.

For example, to find how many 16.9 oz water bottles there are in a gallon, divide 128 by 16.9, that makes 7.57 water bottles of 16.9 oz in 1 gallon.

How many 20 oz water bottles make a gallon

How many 20 oz water bottles make a gallon

How many 20 oz water bottles make a gallon

How many 20 oz water bottles make a gallon

How many 20 oz water bottles make a gallon

In this article:

How many ounces in a gallon?   |   How many ounces in a half-gallon?   |   How many ounces in a quart?   |   How many ounces in a pint?   |   How many ounces in a cup?   |   Free printable charts!   |   Kitchen conversions magnets   |   Detailed volume measurement conversions   |   Convert ounces using measuring cups   |   Related questions

Wondering how many ounces are in a gallon, half a gallon, quart, pint, or cup? We often forget too and have to look this up. Here are all the answers you need to when measuring volume, and handy printable cheat sheets to keep on hand for the next time.

Let’s get started—here are common conversions for fluid ounces using the US measurement system.

How Many Ounces in a Gallon?

How many 20 oz water bottles make a gallon

128 ounces = 1 gallon

There are 128 fluid ounces in a gallon.

How Many Ounces in a Half Gallon?

How many 20 oz water bottles make a gallon

64 ounces = 1/2 gallon

There are 64 fluid ounces in a half-gallon.

How Many Ounces in a Quart?

How many 20 oz water bottles make a gallon

32 ounces = 1 quart

There are 32 fluid ounces in a quart.

How Many Ounces in a Pint?

How many 20 oz water bottles make a gallon

16 ounces = 1 pint

There are 16 fluid ounces in a pint.

How Many Ounces in a Cup?

How many 20 oz water bottles make a gallon

8 ounces = 1 cup

There are 8 fluid ounces in a cup.


Free Printable Cheat Sheets

Download these free printable kitchen measurement charts (including fluid ounce conversions!) to keep on hand for easy reference. They’re a great visual—you can even take screenshots and keep them in the photo section of your phone for easy referencing.

How many 20 oz water bottles make a gallon

How many 20 oz water bottles make a gallon

Sign up for this Subscriber Exclusive Freebie. You’ll get these awesome free charts as a thank you for joining our email list. Please note you’ll get an email asking you to confirm & once you confirm, you’ll receive a separate email with the freebie.

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Kitchen Conversions Magnets

Want something more convenient than a printable? Check out our kitchen measurement magnets, in three unique designs, so you will always have an easy way to reference common cooking conversions.

How many 20 oz water bottles make a gallon

How many 20 oz water bottles make a gallon

Detailed Kitchen Conversions Magnet – SHOP NOW

How many 20 oz water bottles make a gallon

Visual Kitchen Conversions Magnet – SHOP NOW

How many 20 oz water bottles make a gallon

Visual + Detailed Kitchen Conversions – SHOP NOW


Fluid Ounces Measurement Conversions

The US System uses teaspoons, tablespoons, cups, pints, quarts, gallons, and fluid ounces to measure volume. Here are the primary measurement conversions for each.

Ounces (or fl. oz.)

1 fluid ounce = 2 tablespoons = 6 teaspoons = 1/8 cup

One fluid ounce is equal to 2 tablespoons or 1/8 cup.

Teaspoons (or tsp.)

6 teaspoons = 2 tablespoons = 1 fluid ounce

There are 6 teaspoons in a fluid ounce.

Tablespoons (or tbsp.)

2 tablespoons = 1 fluid ounce

There are 2 tablespoons in a fluid ounce.

Cups (or c.)

1 cup = 8 fluid ounces

There are 8 fluid ounces in a cup.

Pint (or pt.)

1 pint = 16 fluid ounces = 2 cups = 1/2 quart = 1/8 gallon

There are 16 fluid ounces in 1 pint.

Quart (or qt.)

1 quart = 32 fluid ounces = 4 cups = 1/4 gallon

There are 32 fluid ounces in a quart.

Gallon (or gal.)

1 gallon = 128 fluid ounces = 16 cups = 8 pints = 4 quarts

There are 128 fluid ounces in a gallon.


Convert Ounces Using Liquid Measuring Cups

A convenient way to measure and convert fluid ounces to cups, pints, quarts, or gallons is to use liquid measuring cups.

You can find a variety of sizes like this set of liquid measuring cups. We love the angled sides to more accurately measure.

  1. Large Measuring Cup: 32 fluid ounces = 4 cups, 1 quart, 1/4 gallon
  2. Medium Measuring Cup: 16 fluid ounces = 2 cups, 1/2 quart, 1/8 gallon
  3. Small Measuring Cup: 8 fluid ounces = 1 cup

You can also find mini liquid measuring cups: 2 ounces = 1/4 cup, 4 tablespoons

A small medicine cup will typically measure in milliliters (ml) and teaspoons (tsp).


Here are answers to common questions about measuring liquids in fluid ounces. Including conversions for specific liquids like water and milk.

How many ounces in a gallon of water?

There are 128 fluid ounces in a gallon of water.

128 fl. oz. = 1 gallon of water

How many ounces are in a gallon of milk?

There are 128 fluid ounces in a gallon of milk.

128 fl. oz. = 1 gallon of milk

How many ounces are in a gallon of ice cream?

There are 128 fluid ounces in a gallon of ice cream, and 64 ounces in a half-gallon of ice cream. No matter what volume is being measured, there will always be 128 fluid ounces in a gallon.

How many 20 ounces are in a gallon?

There are 6.4 20-ounces in a gallon or 128 fluid ounces.

6.4 x 20 fl. oz. = 128 fl. oz. in one gallon

How many 16.9-ounce bottles are in a gallon?

You will need 7.574 16.9-ounce bottles to make one gallon or 128 fluid ounces.

7.574 x 16.9 fl. oz. = 128 fl. oz. in one gallon

How many 16 ounces are in a gallon?

There are 8 16-ounces in a gallon.

8 x 16 fl. oz. = 128 fl. oz. in a gallon.

How many 12 ounces are in a gallon?

You will need 10.6667 twelve-ounce measurements to make one gallon or 128 fluid ounces.

10.6667 x 12 fl. oz. = 128 fl. oz. in a gallon.

How many quarts in a liter?

There are 1.06 quarts in a liter (metric system).

0.95 Quarts (US Measurement System) = 1 Liter (Metric System)

How many 8 oz glasses does it take to make a gallon?

It takes sixteen 8-ounce glasses to make a gallon.

8 fl. oz. x 16 = 128 fl. oz. in a gallon.

How are the US System, British Imperial System, and Metric System different when measuring volume?

The US Customary System, which is the measurement basis for this article, uses fluid ounces as well as cups, pints, quarts, and gallons when measuring volume.

The British Imperial System (also known as the UK Imperial System) also uses fluid ounces (you may hear mention of imperial fluid ounces or imperial gallons); however, the conversion differs slightly from the US system and they don’t use cups at all.

Another system of measuring liquid or volume is the Metric (SI) System, which uses liters as the base units. One liter is equivalent to about 33.814 US fluid ounces.


Final Thoughts

Now that you know how many fluid ounces are in a gallon, it’s time to put your knowledge into practice. Be sure to sign up for our free cheat sheets so you have them on hand for the next time you need to convert ounces to gallons (or cups, pints, or quarts).

How many 20oz bottles go into a gallon?

How many 20 ounces are in a gallon? There are 6.4 20-ounces in a gallon or 128 fluid ounces.

How many 20oz bottles of water should I drink a day?

The general recommendation is for people to drink six to eight glasses of water or other fluids each day. That comes to 48 to 64 ounces of water each day. Because there are 8 fluid ounces in a cup, you should drink eight cups of water per day.

How many water bottles does it take to make a gallon?

We used a free online conversion calculator for liquid measurements to determine there are 128 ounces in one gallon. Divide 128 by 16.9, round up, and we now know that there are eight water bottles in a gallon.

How many 16 oz water bottles does it take to fill up a gallon?

Answer: 8 bottles of 16 oz are required to make one gallon. Let us understand the relationship between ounces and gallons.