How many grams is half a cup of eggs (beaten)?

Half a cup of eggs (beaten) (whole eggs) weighs

122g

That's 4.3oz. In a 250ml metric cup it's 128g.

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

These are USDA weights for US egg sizes, out of the shell. UK sizes are graded differently, so weigh if it matters.

Other amounts of eggs (beaten)

Where these numbers come from

USDA FoodData Central, SR Legacy, food 01123: “Egg, whole, raw, fresh”. USDA lists these household measures for it:

1 large = 50g
1 extra large = 56g
1 jumbo = 63g
1 cup (4.86 large eggs) = 243g
1 medium = 44g
1 small = 38g

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.