How many cups is 200g of mini marshmallows?

200g of mini marshmallows (miniature marshmallows) is

4 cups

That's 4.00 US cups, 3.79 metric cups, or 64 level tablespoons.

Worked out from 1 US cup = 50g. Cups are rounded to the nearest kitchen fraction, with what's left over in level tablespoons. If you have scales, weighing is more accurate.

Other amounts of mini marshmallows

100g: 2 cups
250g: 5 cups
1 cup: 50g
Half a cup: 25g
A quarter cup: 13g
1 tablespoon: 3.1g
Full table for mini marshmallows

Where these numbers come from

USDA FoodData Central, SR Legacy, food 19116: “Candies, marshmallows”. USDA lists these household measures for it:

1 cup of miniature = 50g
10 miniatures = 7g
1 regular = 7.2g

Fractions of a cup are the cup weight scaled down. The tablespoon figure is the cup weight divided by 16, since USDA doesn't list a tablespoon for this ingredient. The teaspoon is a third of the tablespoon. Metric-cup figures assume a 250ml cup, and Australian tablespoons hold 20ml. Weights under 10g are rounded to 0.1g, everything else to the nearest gram. Full source list.