There are 1997 Cheerios in a quart size mason jar – we counted! You need to know the number of Cheerios if you’re trying to win the Guess How Many game, right? We got you!

guess how many in the jar sign with a mason jar of cheerios, pens and cards for making guesses
Can you guess how many Cheerios there are in a Mason jar?

Factors Affecting the Number of Cheerios That Fit in a Mason Jar

The cereal being counted

The brand or type of cereal can make a difference because the size of the cereal can vary between different manufacturers. To be precise, we used General Mills brand Cheerios.

It also matters how close the Cheerios get to the top of the jar. We completely filled our jar to the rim with Cheerios.

What are Cheerios?

Cheerios are grain cereal in little donut shapes.

They were invented in 1941 by General Mills. The name “Cheerios” is derived from the term “Cheer up”. The first Cheerios were made of oats, wheat flour, and barley malt. In 1945, Cheerios were one of the first ready-to-eat cereals to be marketed to children. Since then, Cheerios has been found to be be one of the best healthy cereals for reducing the risk of heart disease and maintaining steady blood sugar levels. Multigrain Cheerios is the best for this.

Cheerios have become a beloved breakfast cereal for generations of families. They come in many flavors, including Honey Nut, Apple Cinnamon, Multi Grain, Fruity and Chocolate varieties. Cheerios can be enjoyed as an easy-to-make snack or a tasty addition to greek yogurt and smoothies from fresh fruit. With their crunchy texture and nutty flavor, it’s no wonder so many people have been enjoying them for so many years!

If you’re looking to have a healthier diet whether to control your blood sugar or prevent weight gain, Cheerios are often the best option with a much higher ratio of grams of fiber to grams of sugar than most cereals.

You can use them in place of graham crackers or Chex mix in recipes. Another great option is topping it off with other healthier items than regular or brown sugar such as coconut flakes, maple syrup, and local honey.

Cheerios are often used as a crunchy topping themselves for things like ice cream and even peanut butter sandwiches! And let’s not forget that they are baby-approved as a fantastic toddler finger food.

The jar used for the Guess How Many game

Not everyone uses a quart sized mason jar for this game. Some use other sizes, and others use entirely different kinds of jars.

We used a classic wide mouth glass mason jar to arrive at our Cheerios count.

Guess How Many In The Jar Formula and Conversion Facts

There will always be some variation depending on how high the jar is filled, but this ought to get you pretty close to the correct number and winning the prize!

Volume of the Jar Formula

The best formula for estimating the volume of a round jar is how to calculate the volume of a cylinder using the formula V = π r2 h.

This means the volume is equal to pi multiplied by the radius squared multiplied by the height of the jar.


  • pi = 3.14
  • the radius of the jar is half of the width.
  • the square of the radius is the same as multiplying the radius times itself.

Jar Calculator Conversions

You need to know the size of the jar too. We use a 64 oz mason jar (A 64 oz jar is the same as a quart jar.)

If it’s not a quart sized jar then you’ll have to do some calculating:

  • A pint-sized mason jar is 1/2 of a quart, so 1,997 / 2= 998
  • There are two quarts in a half gallon, so 1,997 x 2 = 3,994
  • There are four quarts in a gallon, so 1,997 x 4 = 7,988

Are they describing the jar in terms of ounces? Here are some conversions for you:

  • A pint size jar is also a 16 ounce jar
  • A quart size jar is also a 32 ounce jar
  • A half gallon size jar is a 64 ounce jar
  • A gallon size jar is a 128 ounce jar

These size references for jars are fluid ounces!

More about ounces

  • ‘oz.’ is the abbreviation for ‘ounce’!
top view of cheerios in a quart mason jar for the guess how many in the jar game
That’s a lot of Cheerios!

Let’s Play Guess How Many In The Mason Jar!

Want to play Guess How Many In The Jar at your next party?

Grab a quart sized mason jar, a 64 oz bag or larger of your favorite cereal or candy then head on over to Skip to my Lou for step by step instructions plus the awesome free printable signs and cards for the Guess How Many In The Jar Game you see in these photos!

More How Many Fit In a Mason Jar Counts:

Tell us – what did you guess, and how close were you?

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