* Shape and Size: Giant marshmallows are significantly larger and have a different shape than mini marshmallows. You can't just assume that a certain number of mini marshmallows will fit into the same volume as a giant marshmallow.
* Density: Even if you could fit the same volume, giant marshmallows are likely less dense than mini marshmallows, meaning they might weigh less.
To figure out a rough equivalent, you'd need to consider:
* The size of your giant marshmallows: Are they standard jumbo marshmallows or something even larger?
* The density of the marshmallows: How much air is trapped within the marshmallow?
A Better Approach:
Instead of trying to find a direct equivalent, you might consider focusing on the purpose of the marshmallows.
* For a recipe: Adjust the recipe based on the desired texture and sweetness.
* For a snack: Enjoy the different sizes!
Let me know if you have a specific recipe or situation in mind, and I might be able to offer some more helpful advice.