UK ring size F
UK size F is equivalent to US size 3, with an inside diameter of approximately 14.1 mm.
Inside diameter14.1 mm
Inside circumference44.2 mm
How to check UK size F
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 14.1 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.