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RING SIZE GUIDE

How do you order a ring without trying it on?

If it's too small, it won't fit over your knuckle, and if it's too big it won't stay on your finger when you start to slow clap after a dog wins a basketball tournament. Avoid such travesties with our ring size guide

Supplies Needed

  • Ruler with millimetre measurements
  • Nonstretchy string or a strip of paper

Instructions

  1. Wrap a piece of nonstretchy string or a strip of paper around the base of your finger.
  2. Mark the point where it overlaps using a pen or fine-point marker.
  3. Measure the length in millimetres using a ruler.
  4. Compare the length to the ring size chart to determine your ring size.

Ring Size Chart

   Size   

  Length  

Size 5

49 mm

Size 6

51.5 mm

Size 7

54 mm

Size 8

56.5 mm

Size 9

59.1 mm

Size 10

61.6 mm

Size 11

64.1 mm

Size 12

66.6 mm

Size 13

69.1 mm

Measuring Tips

  • All measurements match the inside circumference of the ring.
  • If your finger measurement falls between sizes, order the larger size.
  • Fingers, like brains, are smaller in the morning and bigger by the end of the day. Measure your fingers at the end of the day.
  • Take multiple measurements to ensure an accurate reading.
  • Weather and temperature affect finger size. Do these measurements where it's moderately warm.
  • If you have large knuckles, measure both the base of your finger and your knuckle, and select a size between the two.
  • Fingers tend to be one half-size larger on your dominant hand.

International Ring Size Conversion Chart

Circumference (mm)
Europe / ISO 

Diameter (mm) 

USA / Canada 

UK / Australia 

Asia 

Switzerland 

44.2 

14.1 

44.8 

14.3 

F-1/2 

5-1/4 

45.5 

14.5 

3-1/2 

46.1 

14.7 

G-1/2 

6-1/2 

46.8 

14.9 

47.4 

15.1 

H-1/2 

7-3/4 

48.0 

15.3 

4-1/2 

48.7 

15.5 

49.3 

15.7 

J-1/2 

50.0 

15.9 

10 

50.6 

16.1 

5-1/2 

K-1/2 

10 

51.2 

16.3 

11-3/4 

51.9 

16.5 

6

L-1/2 

11 

12-3/4 

52.5 

16.7 

12 

53.1 

16.9 

6-1/2 

M-1/2 

13 

14 

53.8 

17.1 

54.4 

17.3 

N-1/2 

14 

15-1/4 

55.1 

17.5 

55.7 

17.7 

7-1/2 

O-1/2 

15 

16-1/2 

56.3 

17.9 

57.0 

18.1 

P-1/2 

16 

17-3/4 

57.6 

18.3 

58.3 

18.5 

8-1/2 

Q-1/2 

17 

58.9 

18.8 

19 

59.5 

19.0 

R-1/2 

18 

60.2 

19.2 

20-1/4 

60.8 

19.4 

9-1/2 

S-1/2 

19 

61.4 

19.6 

21-1/2 

62.1 

19.8 

10 

T-1/2 

20 

62.7 

20.0 

21 

63.4 

20.2 

10-1/2 

U-1/2 

22 

22-3/4 

64.0 

20.4 

64.6 

20.6 

11 

V-1/2 

23 

65.3 

20.8 

25 

65.9 

21.0 

11-1/2 

W-1/2 

24 

66.6 

21.2 

67.2 

21.4 

12 

X-1/2 

25 

27-1/2 

67.8 

21.6 

68.5 

21.8 

12-1/2 

26 

28-3/4 

69.1 

22.0 

Z-1/2 

69.7 

22.2 

13 

27 

70.4 

22.4 

Z + 1 

71.0 

22.6 

13-1/2