ISO 56 in US Ring Size

ISO 56 ≈ US 7.5

Ring Size

Inner circumference:55.1-56.4mm

Ring Sizes Around ISO 56

US	UK	ISO / EU	JP / KR	Diameter (mm)	Circumference (mm)
6	L	52	12	16.5	51.9
6.5	M	53	13	16.9	53.1
7	N	54	14	17.3	54.4
7.5	O	56	15	17.7	55.7
8	P	57	16	18.1	57
8.5	Q	58	18	18.6	58.3
9	R	60	19	18.9	59.5

Nearby sizes:

Does ISO 56 round up or down in US?

Fingers swell through the day, so size a 7.5 to fit in the evening when the hand is largest; a morning-perfect ring can bind by nightfall.