How many grams is half a cup of cottage cheese?

Half a cup of cottage cheese weighs

113g

That's 4oz. In a 250ml metric cup it's 119g.

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

Other amounts of cottage cheese

1 cup: 225g
A quarter cup: 56g
1 tablespoon: 14g
Full table for cottage cheese

Where these numbers come from

USDA FoodData Central, SR Legacy, food 01012: “Cheese, cottage, creamed, large or small curd”. USDA lists these household measures for it:

4 oz = 113g
1 cup, large curd (not packed) = 210g
1 cup, small curd (not packed) = 225g

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.