UK ring size T ½
UK size T ½ is equivalent to US size 10, with an inside diameter of approximately 19.8 mm.
Inside diameter19.8 mm
Inside circumference62.1 mm
How to check UK size T ½
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 19.8 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.