How Many M&M's Fit in a Jar? (8 oz to 1 Gallon, Plain & Peanut)
By Sweet Trolley ·
#calculator #candy jar #guessing game #m&ms #mason jar
Whether you're filling a jar for a party guessing game, a candy buffet, or just a colorful jar for your desk, M&M's are a classic pick — and the first question is always how many will actually fit. Here's the answer by jar size, the difference between plain and peanut, the quick math, and a free tool to calculate any jar.
How many M&M's fit in a jar? (quick answer)
M&M's are small and round, so they pack tightly with very little wasted space — about 24 plain M&M's per fluid ounce of jar. That single number lets you estimate any container, but here are the sizes people ask about most, worked out for you.
How many M&M's fit in a mason jar?
A regular-mouth pint mason jar (16 oz) holds about 375 plain M&M's, and a quart mason jar (32 oz) holds about 760. Wide-mouth jars hold roughly the same — the volume is what matters, not the lid. If your mason jar is a different size, find it in the table below.
M&M's by jar size (8 oz to 1 gallon)
| Jar size | Approximate plain M&M's | Approximate peanut M&M's |
|---|---|---|
| 8 oz jar (1 cup) | ~190 | ~80 |
| 12 oz jar | ~285 | ~120 |
| 16 oz jar (pint mason jar) | ~375 | ~160 |
| 24 oz jar | ~570 | ~240 |
| 32 oz jar (quart mason jar) | ~760 | ~320 |
| 62 oz jar (large club-store jar) | ~1,465 | ~620 |
| 64 oz jar (half-gallon) | ~1,510 | ~640 |
| 1 gallon jar (128 oz) | ~3,025 | ~1,280 |
These are estimates — the real number shifts with the exact jar shape and how the candies settle — but they'll get you close. For a jar size that isn't listed, multiply the ounces by 24 for plain M&M's or by 10 for peanut.
How many M&M's fit in a gallon jar?
Right around 3,000 plain M&M's (about 1,280 peanut). A gallon of M&M's weighs roughly 6 pounds — it's the classic "nobody's guessing this by eye" contest jar.
How many peanut M&M's fit in a jar?
Peanut M&M's are much larger than plain ones, so far fewer fit — a little under half as many in the same jar, about 10 per fluid ounce. That's roughly 160 in a 16 oz jar, 320 in a 32 oz quart, 640 in a 64 oz half-gallon, and 1,280 in a gallon. The peanut column in the table above covers every common size; for anything else, use the calculator below.
Calculate your exact jar
Got a different size, or want a precise number for plain or peanut? Use our free Candy Jar Calculator — pick your candy and jar size and it estimates the count instantly. It works for jellybeans, Hershey's Kisses, gummy bears, and more, too.
The quick math (for any candy)
You can't just divide the jar's volume by one M&M, because they don't pack perfectly — there's air between them. The rule of thumb: take the jar's volume, multiply by about 0.8 to account for the gaps (small round candies pack efficiently), and divide by the volume of one M&M.
Winning the guessing jar
Facing a contest jar? Skip the math: estimate how many M&M's cover the bottom layer, multiply by how many layers tall the jar is, then take about 80% of that. Simple, and it lands far closer than a wild guess.
Build your own M&M's jar
Running a guessing contest, candy buffet, or just want a vibrant filled jar? Build a personalized candy jar with the candy you love and add your name, logo, or a message. For events and contests, you can order jars in bulk with volume discounts.
Running a guess-how-many contest?
Order a gallon of candy we've counted and sealed — the official number ships in a sealed envelope, so nobody knows it until you open it.