Exact ring size conversion

UK ring size N ½

UK size N ½ is equivalent to US size 7, with an inside diameter of approximately 17.3 mm.

Inside diameter17.3 mm
Inside circumference54.4 mm

How to check UK size N 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 17.3 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.

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