There are 1974 coffee beans in a quart-size mason jar – we counted! (Here’s where you can find how many jelly beans are in a mason jar!) You need to know the number of coffee beans 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 full of roasted coffee beans, pens and cards for making guesses
Can you guess how many coffee beans there are in a Mason jar?

Factors Affecting the Number of Coffee Beans That Fit in a Mason Jar

The beans being counted

For coffee beans, it’s not so much about the type of bean as it is about the roast level of the coffee beans can make a difference. Fresh green beans are larger than dry beans because of how much water they hold. The longer the bean is roasted, the more it shrinks.

To be precise, we used an espresso roast of whole beans.

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

What are coffee beans?

Coffee beans are the seeds found in the fruit called the “cherry” of the coffee plant. They are roasted and ground to make coffee.

Coffee beans come in a variety of flavors and colors, depending on the type of coffee plant they are from. They can be roasted to different levels, which will affect the flavor of the coffee.

Coffee beans are typically packaged in airtight containers to preserve their freshness. They can be stored at room temperature or in the fridge or freezer.

The type and size of the mason 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.

Mason jars were first invented in 1858 by John Landis Mason. He created the jars as a way to make canning easier and more efficient. Mason jars quickly became popular, and by the early 1900s, they were being used to store everything from food to gasoline.

The popularity of mason jars has continued to grow over the years, and they are now used all over the world for a variety of purposes. The regular and wide mouth measurements have become so standard such that many other things are made to fit them, from pump tops for soap dispensers to pans for chicken feeders.

‘Ball’ is a company that produces glass items, including mason jars. When you see a reference to ball jars, this really means a regular mason jar.

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 1,974 / 2= 987
  • There are two quarts in a half gallon, so 1,974 x 2 = 3,948
  • There are four quarts in a gallon, so 1,974 x 4 = 7,896

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 coffee beans in a mason jar for the guess how many game
That’s a lot of beans!

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 beans 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:

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