How many cups is 250g of grated mozzarella?

250g of grated mozzarella (shredded mozzarella) is

2¼ cups

That's 2.23 US cups, 2.11 metric cups, or 36 level tablespoons.

Worked out from 1 US cup = 112g. 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 grated mozzarella

100g: ¾ cup + 2 tbsp
200g: 1¾ cups + 1 tbsp
1 cup: 112g
Half a cup: 56g
A quarter cup: 28g
1 tablespoon: 7g
Full table for grated mozzarella

Where these numbers come from

USDA FoodData Central, SR Legacy, food 01026: “Cheese, mozzarella, whole milk”. USDA lists these household measures for it:

1 cup, shredded = 112g
1 oz = 28.35g
6 slices = 170g

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.