There are 1205 pumpkin seeds in a quart size mason jar – we counted! You need to know the number of pumpkin seeds 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 pumpkin seeds, pens and cards for making guesses
Can you guess how many pumpkin seeds there are in a Mason jar?

Factors Affecting the Number of Pumpkin Seeds That Fit in a Mason Jar

The items being counted

The state of pumpkin seeds can make a difference because green pumpkin seeds are larger than roasted pumpkin seeds because of their higher water content. To be precise, we used roasted pumpkin seeds.

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

What are pumpkin seeds?

Pumpkin seeds come from the inside of a pumpkin (or jack-o-lantern). Whether a sugar pumpkin that’s great for pies or one more suited to pumpkin carving, the seeds can be found in a meshy pulp in the middle of the pumpkin.

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 glass mason jar to arrive at our pumpkin seed 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 1,205 / 2= 602
  • There are two quarts in a half gallon, so 1,205 x 2 = 2,410
  • There are four quarts in a gallon, so 1,205 x 4 = 4,820

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

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 pumpkin seeds or your favorite 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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