How many calories in .5 cups of sugar?

4 fluid ounces (US) or a gill.

4 fluid ounces imperial = 1/2 a small cup
5 fluid ounces imperial = 1/2 a large cup

a US cup = 237 ml
an imperial sm. cup = 1/4 fifth = 227 ml
an imperial lg. cup = 1/2 pint = 283.5 ml