Download and print ring size guide

Print the Page and measure your existing Ring. See below for more Detailed instructions.

Please contact hello@boltenstern.com with any questions or for additional help

Ring size conversion chart
Finger
Circumference
(MM)
Ring
Diameter
(MM)
Ring size
EUROPE USA UK JAPAN
44 14,01 44 3 F 1/2 4
45 14,33 45 3 1/4 G 5
46 14,65 46 3 3/4 H 6
47 14,97 47 4 H 1/2 7
48 15,29 48 4 1/2 I 1/2 8
49 15,61 49 4 3/4 J 1/2 9
50 15,92 50 5 1/4 K 10
51 16,24 51 5 3/4 L 11
52 16,56 52 6 L 1/2 12
53 16,88 53 6 1/4 M 1/2 13
54 17,20 54 6 3/4 N 1/2 14
55 17,52 55 7 1/4 O 15
56 17,83 56 7 1/2 P 16
57 18,15 57 8 P 1/2 17
58 18,47 58 8 1/4 Q 1/2 18
59 18,79 59 8 3/4 R 19
60 19,11 60 9 S 20
61 19,43 61 9 1/2 S 1/2 21
62 19,75 62 10 T 1/2 22
63 20,06 63 10 1/4 U 1/2 23
64 20,38 64 10 3/4 V 24
65 20,70 65 11 W 25
66 21,02 66 11 1/2 W 1/2 26
67 21,34 67 11 3/4 X 1/2 27
68 21,66 68 12 1/4 Z 28
69 21,97 69 12 1/2 Z 1/2 29
70 22,29 70 13 30
71 22,61 71 13 1/4 31
To determine your ring size, you measure your finger:
  1. Use a length of string, ribbon or dental floss and wrap it around the base of your finger
  2. Use a pen to mark the point on the string when the end meets
  3. Use a ruler to measure the string, in millimeters
  4. Use the chart to find your size: choose the closest measurement to the chart, and if you appear to be between two sizes, we recommend choosing the largest size
  5. You can measure your knuckle as well to ensure you select a size that will slide on and off your finger easily
Measure existing rings

Download and print the ring size guide

  1. In your 'printing settings', ensure that 'page scaling' is set on 'none' before you print
  2. The ring size chart should be printed in a full "A4 (81/2x11 inches)" size page, you can check the printing scale measuring the samples below
  3. Use a regular ring that perfectly fits and place it on the circles below: the outline of your ring should meet perfectly the circumference of the circle
  4. Choose the matching size in the conversion chart

If you would like further assistance, contact us or visit our store. We are dedicated to fulfilling your wishes.