How many grams is half a cup of grated carrot?

Half a cup of grated carrot (shredded carrot) weighs

55g

That's 1.9oz. In a 250ml metric cup it's 58g.

This uses the US cup, the size American recipes mean. Half a cup is 118ml by volume.

Other amounts of grated carrot

Where these numbers come from

USDA FoodData Central, SR Legacy, food 11124: “Carrots, raw”. USDA lists these household measures for it:

1 cup chopped = 128g
1 cup grated = 110g
1 cup strips or slices = 122g
1 large (7-1/4" to 8-/1/2" long) = 72g
1 medium = 61g
1 small (5-1/2" long) = 50g
1 slice = 3g
1 strip large (3" long) = 7g
1 strip medium = 4g

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.