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Ring Sizing Method 1

Measure the internal diameter of an existing ring that fits in millimeters.

Internal Dia (mm)

14.1

14.9

15.7

16.5

17.3

18.1

19.0

19.8

20.6

21.4

22.2

US/Canada

3

4

5

6

7

8

9

10

11

12

13

UK/Australia

F

H

J

L

N

P

R

T

V

X

Z

Ring Sizing Method 2

Measure your finger with a strip of paper or a string (or thread or ribbon); mark the spot where the paper or string meets. Measure that section of paper or string with a ruler in millimeters. This represents the circumference of the ring. Make the paper or string fit snugly, yet comfortably; if possible – get someone to help you get the measurement.

Circumference (mm)

44.2

46.8

49.3

51.9

54.4

57.0

59.5

62.1

64.6

67.2

67.7

US/Canada

3

4

5

6

7

8

9

10

11

12

13

UK/Australia

F

H

J

L

N

P

R

T

V

X

Z

Ring Sizing Tips:

  • Wait to measure your finger at the end of the day when it’s the largest size.
  • Measure warm fingers because cold temperatures can shrink finger sizes (up to 0.5 a size).
  • Wait at least 12 hours after drinking alcohol and/or eating salty foods because they can cause swelling in your fingers.

When choosing sizes of bracelets, necklaces, and even earrings, measuring existing jewelry as a guide is effective.