ISO 61 in UK Ring Size

ISO 61 ≈ UK S

Ring Size

Inner circumference:60.2-61.5mm

Ring Sizes Around ISO 61

US	UK	ISO / EU	JP / KR	Diameter (mm)	Circumference (mm)
8	P	57	16	18.1	57
8.5	Q	58	18	18.6	58.3
9	R	60	19	18.9	59.5
9.5	S	61	20	19.4	60.8
10	T	62	21	19.8	62.1
10.5	U	63	23	20.2	63.4
11	V	65	24	20.6	64.6

Nearby sizes:

Does ISO 61 round up or down in UK?

Size to the knuckle; a snug 9.5 on a larger finger leaves little margin for the daily swelling that can add most of a size by evening.