US ring size 5

US size 5 has an inside diameter of approximately 15.7 mm and an inside circumference of 49.3 mm.

How to check whether size 5 fits

Measure the inside diameter of a ring that already fits the intended finger. Measure straight across the widest inside point—do not include the metal. Compare that measurement with 15.7 mm.

This is a jewellery-size conversion, not a guarantee of fit. Finger size changes with temperature and time of day; wide bands often need extra room.