Who wears a size 8
A US 8 is the upper half of the women’s range and below most men’s sizes (9 to 12). Jewellers’ order data puts the most common women’s size at 7 and men’s at 10, so a 8 is 1 size above the usual women’s size and 2 sizes below the usual men’s size. The same finger is often a quarter to half size larger on the dominant hand.
It is 0.41 mm wider inside than a 7½ (17.73 mm) and 0.41 mm narrower than a 8½ (18.54 mm). On the circumference that is 1.28 mm per half size, which is why a strip of string, stretching a couple of millimetres as you pull it snug, can misread a 8 by most of a size.