How many cups is 400mg?

Answer 1

4-5 teaspoons

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You can not equate a unit of volume (the teaspoon) with a unit of mass (the mg) because it depends on what you are measuring (its density).

Answer 2

This would depend on the density of the material that is being measured (water, sand, food). Cups is a unit of volume, while mg (grams) is mass or weight.

Answer 3

That is approximately 0.882 cups.