Size Chart

RING SIZE (AUS/UK)

INSIDE DIAMETER (MM)

INSIDE CIRCUMFERENCE (MM)

A 1/2

12.18mm

38.26mm

B

12.37mm

38.86mm

B 1/2

12.60mm

39..58mm

C

12.78mm

40.15mm

C 1/2

13mm

40.84mm

D

13.21mm

41.50mm

D 1/2

13.41mm

42.13mm

E

13.61m

42.76mm

E 1/2

13.83mm

43.45mm

F

14.05mm

44.14mm

F 1/2

14.15mm

44.45mmm

G

14.36mm

45.11mm

G 1/2

14.56mm

45.74mm

H

16.65mm

46.02mm

H 1/2

14.86mm

46.68mm

I

15.04mm

47.25mm

I 1/2

15.27mm

47.25mm

J

15.40mm

47.38mm

J 1/2

15.70mm

49.32mm

K

15.80mm

49.64mm

K 1/2

16mm

50.27mm

L

16.10mm

50.58mm

L 1/2

16.41mm

51.55mm

M

16.51mm

51.87mm

M 1/2

16.71mm

52.50mm

N

16.92mm

53.16mm

N 1/2

17.13mm

53.82m

O

17.35mm

54.51mm

O 1/2

17.45mm

54.82mm

P

17.75mm

55.76mm

P 1/2

17.97mm

56.45mm

Q

18.19mm

57.15mm

Q 1/2

18.35mm

57.65mm

R

18.61mm

58.47mm

R 1/2

18.80mm

59.06mm

S

19.10mm

60mm

S 1/2

19.31mm

60.66mm

T

19.51mm

61.29mm

T 1/2

19.84mm

62.33mm

U

20.02mm

62.89mm

U 1/2

20.20mm

63.46mm

V

20.32mm

63.97mm

V 1/2

20.68mm

64.97mm

W

20.76mm

65.22mm

W 1/2

20.94mm

65.78mm

X

21.18mm

66.54mm

X 1/2

21.30mm

66.92mm

Y

21.49mm

67.51mm

Y 1/2

21.69mm

68.14mm

Z

21.89mm

68.77mm

Z + 1/2

22.10mm

69.43mm

Z + 1

22.33mm

70.15mm

Z + 1.5

22.60mm

71mm

Z + 2

22.69mm

71.28mm

Z + 2.5

22.92mm

72mm

Z + 3

23.06m

72.45mm

Z + 3.5

23.24mm

73.01mm

Z + 4

23.47mm

73.73mm

Z + 4.5

23.55mm

73.98mm

Z + 5

23.87mm

74.99mm

Z + 6

24.27mm

76.25mm

SIZE

INSIDE CIRCUMFERENCE (MM)

SIZE DIRECTIVE

Size 15

150mm

XX-SMALL

Size 16

156mm

X-SMALL

Size 17

162mm

SMALL

Size 18

168mm

MEDIUM

Size 19

175mm

LARGE

Size 20

181mm

X-LARGE

Size 21

187mm

XX-LARGE

Size 22

194mm 

XXX- Large