Have you ever read a product description for a cup online? Maybe it was listed that it had a 22 ounce capacity. That number probably went in and out of your head without really making much of an impression.

If you look up “ounce” in the dictionary, you’d find the definition “a small portion or amount,” which is pretty useless. After all, that doesn’t tell you how much coffee your mug will hold or how much water you can fit in your bottle.

Fluid ounces can be tricky to visualize without some kind of reference point. Luckily, this guide is here to help you understand drinkware portion sizes once and for all!

How Big is an Ounce?

An ounce is about as big as your thumb. You can also think of it being roughly the same size as a 1-inch meatball or 3 small dice.

The chart below shows you how fluid ounces compare to other liquid measurements:

ounce conversion chart

1 fluid ounce =

  • 0.0625 pints
  • 0.03 quarts
  • 0.13 cups
  • 2 tablespoons
  • 6 teaspoons
  • 29.5 milliliters

Fluid ounces are relatively tiny when compared to other portion sizes. You should aim to buy drinkware that has a higher ounce (oz.) capacity, so you don’t have to get as many refills.

Fluid Ounce Sizes for Drinkware

Ounce sizes will vary depending on where you purchase your cups, glasses, and mugs. However, if you want a general idea, let’s look at the sizes of custom drinkware at Quality Logo Products®.

Plastic Cups

plastic cup ounce sizes

Ounce Sizes: 5 oz. to 32 oz.

Average Ounce Size: 16 oz.

Water Bottles

water bottle ounce sizes

Ounce Size: 2.5 oz. to 64 oz.

Average Ounce Size: 22 oz.

Coffee Mugs

coffee mug ounce sizes

Ounce Size: 4 oz. to 23 oz.

Average Ounce Size: 13 oz.

Travel Mugs

travel mug ounce sizes

Ounce Size: 11 oz. to 30 oz.

Average Ounce Size: 20 oz.


tumbler ounce sizes

Ounce Size: 10 oz. to 30 oz.

Average Ounce Size: 20 oz.

Mason Jars

mason jar ounce sizes

Ounce Size: 3.7 oz. to 30 oz.

Average Ounce Size: 17 oz.

Shaker Bottles

shaker bottle ounce sizes

Ounce Size: 16 oz. to 32 oz.

Average Ounce Size: 23 oz.

Shot Glasses

shot glass ounce sizes

Ounce Size: 1 oz. to 3.7 oz.

Average Ounce Size: 1.5 oz.

Drinking Glasses

drinking glass ounce sizes

Ounce Sizes: 1.75 oz. to 44 oz.*

Average Ounce Size: 16 oz.

*These ounce sizes exclude glass bottles and beer growlers.

How Big is 22 Ounces?

You now have a pretty good idea of how big an ounce is, but what about 22 ounces? This graphic shows you a range of drink sizes, from 1 ounce all the way to 64 ounces.

22 fluid ounces is the same size as 0.65 liters. This is about one-third of a 2-liter bottle of soda.

Overall, you can expect to use drinkware that hold less than a 2-liter bottle of soda. Keep that in mind since health experts recommend that men drink 125 ounces (3.7 liters) and women drink 91 ounces (2.7 liters) of water every single day.

How to Measure Ounce Size

Here are some ways you can find out how many fluid ounces your drinkware holds:

  • Check the product description.
  • Use water and a measuring cup or spoon.
  • Weigh water in a glass bowl on a scale.
  • Look for ounce markings on the side of the glass or bottle.
  • Ask the manufacturer.

Even if you don’t remember where you bought your cup, mug, or water bottle, you can still figure out the ounce capacity. You just need a few cooking basics that you already have in your kitchen!

Final Thoughts

There you have it! You should now have a better grip on fluid ounce sizes and how those portions look in your favorite drinkware. Now all you have to do is start drinking more water!


University of Rochester Medical Center. Visualize Your Portion Size. Retrieved from, https://www.urmc.rochester.edu/MediaLibraries/URMCMedia/ctsi/resources/crc/documents/VisualizeYourPortionSize12-01-09.pdf

The Joint Chiropractic. A Handy Guide to Portion Size. Retrieved from, https://www.thejoint.com/illinois/shiloh/shiloh-21002/197290-handy-guide-to-portion-size Cleveland Clinic. (2021, November 23). How Much Water Do You Need Daily? Retrieved from, https://health.clevelandclinic.org/how-much-water-do-you-need-daily/

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