Japanese Ring Size Chart

Before placing your order, please make sure to measure your ring size and refer to the size chart below to ensure a comfortable fit.

How to Measure Your Ring Size

Method 1｜Using an Existing Ring

  1. Choose a ring that fits comfortably.
  2. Place the ring flat on a ruler and measure the inner diameter in millimeters (mm).

Method 2｜Using a String or Paper Strip

  1. Wrap a thin string or strip of paper around the widest part of your finger. Pull it snugly, but not too tight.
  2. Mark the point where the ends overlap. Then straighten it out and use a ruler to measure the circumference length in millimeters (mm).
Japanese Ring Size Inner Circumference (mm) Inner Diameter (mm)
1 40.8 13
2 41.9 13.4
3 42.9 13.7
4 44 14
5 45 14.4
6 46.1 14.7
7 47.1 15
8 48.2 15.4
9 49.2 15.7
10 50.3 16
11 51.3 16.4
12 52.4 16.7
13 53.4 17
14 54.5 17.4
15 55.5 17.7
16 56.5 18
17 57.6 18.4
18 58.6 18.7
19 59.7 19
20 60.7 19.4