The Candies in a Mason Jar calculator computes the approximate number of candies in quart mason jar. 
Quart Mason Jar
INSTRUCTIONS: Enter the following:
- (PF) Percent Full.
- (MJ) Choose Mason Jar Size
Number of Candies: The calculator returns a good estimate on the number of the following candies in the mason jar.
- Mini Jelly Beans
- Regular Jelly Beans
- Jumbo sized Jelly Beans
- M&Ms
- Peanut M&Ms or
- Gum Balls
- Candy Corn
- Candy Pumpkins
- Skittles
- Mini Tootsie Rolls (Midgees)
The Math / Science
The typical mason jar holds one quart in volume. However, mason jars do come in half pints (cup), pints, quarts and half gallons. The Candies in a Mason Jar calculator uses the percent full (PF) to estimate the volume of candies in jar. If it's filled to the very top, it's more than 100%, approximately 110%.
The volume of candies the mason jar is:
V = MJS * PF
where:
- V = volume of candies
- PF = Percent Full
- MJS = Mason Jar Size
Density of Candy
The math behind Candies in Container calculators is pretty straight forward. We use basic Euclidean (3D) geometry to compute the volume of the containers based on their shapes. Once we know the volume, we are able to make reasonable estimates based on an average number of candies in a known volume. We (Issac and Poppy) bought large bags of the different types of candies and our candy expert (see picture) measured them in kitchen measuring bowls. Then we counted the number of candies and did the math to get the estimated number of candies in a gallon container. Here the results.
The Candies in a Container calculator uses the following densities of candies: 
- Mini Jelly Beans: 3,500 mini Jelly Bean candies in a gallon.
- Jelly Beans: 930 Jelly Beans in a gallon
- Jumbo Jelly Beans: 736 Jumbo sized Jelly Beans in a gallon
- M&Ms: 3991 plain M&Ms in a gallon.
- Peanut M&Ms: 1248 Peanut M&Ms in a gallon
- Gum Balls: 1264 Gum Balls in a gallon.
- Candy Corn: 1524 kernels of candy corn in a gallon
- Candy Pumpkins: 378 pumpkin candies in a gallon
- Skittles: 3600 Skittles in a gallon
- Tootsie Roll Midgees: 296 Tootsie Roll Midgees in a gallon
These are only an estimates, because the candy manufactures may vary the sizes of the candies, but this is a decent estimate of the average size of the different candies and your guess, using these calculators, will be much less of a guess.
Candies in a Container Calculators
The following calculators let you enter the dimensions of the container and return the number of candies for a list of different types of candies including: mini Jelly Bean, Jelly Beans, Jumbo sized Jelly Beans, M&Ms, Peanut M&Ms, Gum Balls, candy corn, pumpkin candies, Skittles, Tootsie Roll Midgees.
Candy Bowl Shape Calculators
- Candies in a Jar
- Candies in a Rectangular Container
- Candies in Spherical Container
- Candies in Tapered Rectangular Container
- Candies in Tapered Round Bowl
- Candies in Mason Jar
- Candies in Curved Bowl
- Candies in Irregular Container
Specific Candies
- Mini Jelly Beans in a Jar - Jelly Bellies are mini jelly beans.
- Jumbo Jelly Beans in a Jar
- M&M's in a Jar
- Peanut M&M's in a Jar
- Gum Balls in a Jar
- Jumbo Jelly Beans per Gallon
- M&M's per Gallon
- Peanut M&M's per Gallon
- Gum Balls per Gallon
- Candies in a Mason Jar
- Jelly Beans in a Mason Jar
- Mini Jelly Beans in a Mason Jar - Jelly Bellies are mini jelly beans.
- Jumbo Jelly Beans in a Mason Jar
- M&M's in a Mason Jar
- Peanut M&M's in a Mason Jar
- Gum Balls in a Mason Jar