Ring Size Conversion Chart

UK H½
US 4
JAPAN 7
EURO 6
DIAMETER (mm) 14.8
CIRCUMFERENCE (mm) 46.5
UK I½
US 4½
JAPAN 8
EURO 8
DIAMETER (mm) 15.2
CIRCUMFERENCE (mm) 48
UK J½
US 5
JAPAN 9
EURO 9
DIAMETER (mm) 15.6
CIRCUMFERENCE (mm) 49
UK L
US 5½
JAPAN 10
EURO 10
DIAMETER (mm) 16
CIRCUMFERENCE (mm) 50.5
UK M
US 6
JAPAN 12
EURO 12
DIAMETER (mm) 16.4
CIRCUMFERENCE (mm) 52
UK N
US 6½
JAPAN 13
EURO 13
DIAMETER (mm) 16.8
CIRCUMFERENCE (mm) 53
UK O
US 7
JAPAN 14
EURO 14
DIAMETER (mm) 17.3
CIRCUMFERENCE (mm) 54.5
UK P
US 7½
JAPAN 15
EURO 15
DIAMETER (mm) 17.7
CIRCUMFERENCE (mm) 55.5
UK Q
US 8
JAPAN 16
EURO 17
DIAMETER (mm) 18.1
CIRCUMFERENCE (mm) 57
UK Q½
US 8½
JAPAN 17
EURO 18
DIAMETER (mm) 18.5
CIRCUMFERENCE (mm) 58
UK R½
US 9
JAPAN 18
EURO 19
DIAMETER (mm) 18.9
CIRCUMFERENCE (mm) 59.5
UK S½
US 9½
JAPAN 20
EURO 21
DIAMETER (mm) 19.3
CIRCUMFERENCE (mm) 61
UK T½
US 10
JAPAN 21
EURO 22
DIAMETER (mm) 19.7
CIRCUMFERENCE (mm) 62
UK U½
US 10½
JAPAN 22
EURO 23
DIAMETER (mm) 20.1
CIRCUMFERENCE (mm) 63.5
UK V½
US 11
JAPAN 24
EURO 24
DIAMETER (mm) 20.6
CIRCUMFERENCE (mm) 64.5
UK W½
US 11½
JAPAN 25
EURO 26
DIAMETER (mm) 21
CIRCUMFERENCE (mm) 66
UK Y
US 12
JAPAN 26
EURO 27
DIAMETER (mm) 21.4
CIRCUMFERENCE (mm) 67.5
UK Z
US 12½
JAPAN 27
EURO 28
DIAMETER (mm) 21.8
CIRCUMFERENCE (mm) 68.5
UK Z+1
US 13
JAPAN 28
EURO 30
DIAMETER (mm) 22.2
CIRCUMFERENCE (mm) 70
UK Z+2
US 13½
JAPAN 29
EURO 31
DIAMETER (mm) 22.6
CIRCUMFERENCE (mm) 71
UK Z+3
US 14
JAPAN 31
EURO 32
DIAMETER (mm) 23
CIRCUMFERENCE (mm) 72.5
UK Z+4
US 14½
JAPAN 32
EURO 34
DIAMETER (mm) 23.4
CIRCUMFERENCE (mm) 74
UK Z+5
US 15
JAPAN 33
EURO 35
DIAMETER (mm) 23.9
CIRCUMFERENCE (mm) 75

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