Interesting fact: A marshmallow is mostly sugar foam, so it is much lighter than its size suggests.
The answer: Typically, a marshmallow weighs about 7 to 10 grams (0.25 to 0.35 ounces). The exact weight depends on size, variety, preparation, brand, and how much edible or non-edible material is included.
Snack weights vary by brand, package size, filling, and air content. A useful average makes it easier to compare portions, read nutrition labels, and understand how small-looking treats can add up quickly.
