---
# System prepended metadata

title: International Ring Size Conversion Chart
tags: [rings, chart, size, jewelery, measure, design, standard, international]

---

# International Ring Size Conversion Chart
###### tags: `jewelery` `design` `standard` `international` `chart` `rings` `size` `measure`

|        ⌀ mm       |        ⌀ Inches        |   ↔ mm  | ↔ Inches |  British & Australian  |  US & Canada  |  French & Russian  |  German  |  Japanese  |   Swiss  |
| :---------------: | :--------------------: | :-----: | :------: | :--------------------: | :-----------: | :----------------: | :------: | :--------: | :------: |
|        9.91       |          0.390         |  31.13  |   1.22   |            —           |      0000     |          —         |     —    |      —     |     —    |
|       10.72       |          0.442         |  33.68  |   1.39   |            —           |       00      |          —         |     —    |      —     |     —    |
|       11.53       |          0.454         |  36.22  |   1.43   |            —           |       0       |          —         |     —    |      —     |     —    |
|       11.95       |          0.474         |  37.54  |   1.49   |            A           |      1/2      |          —         |     —    |      —     |     —    |
|       12.18       |          0.482         |  38.26  |   1.51   |          A 1/2         |      3/4      |          —         |     —    |      —     |     —    |
|       12.37       |          0.487         |  38.86  |   1.53   |            B           |       1       |          —         |     —    |      1     |     —    |
|       12.60       |          0.496         |  39.58  |   1.56   |          B 1/2         |     1 1/4     |          —         |     —    |      —     |     —    |
|       12.78       |          0.503         |  40.15  |   1.58   |            C           |     1 1/2     |          —         |     —    |      —     |     —    |
|       13.00       |          0.512         |  40.84  |   1.61   |          C 1/2         |     1 3/4     |          —         |     —    |      —     |     —    |
|       13.21       |          0.520         |  41.50  |   1.63   |            D           |       2       |       41 1/2       |  13 1/2  |      2     |   1 1/2  |
|       13.41       |          0.528         |  42.13  |   1.66   |          D 1/2         |     2 1/4     |          —         |     —    |      —     |     —    |
|       13.61       |          0.536         |  42.76  |   1.68   |            E           |     2 1/2     |       42 3/4       |  13 3/4  |      3     |   2 3/4  |
|       13.83       |          0.544         |  43.45  |   1.71   |          E 1/2         |     2 3/4     |          —         |     —    |      —     |     —    |
|       14.05       |          0.553         |  44.14  |   1.74   |            F           |       3       |         44         |    14    |      4     |     4    |
|       14.15       |          0.557         |  44.45  |   1.75   |          F 1/2         |     3 1/8     |          —         |     —    |      —     |     —    |
|       14.25       |          0.561         |  44.77  |   1.76   |          F 3/4         |     3 1/4     |          —         |     —    |      —     |     —    |
|       14.36       |          0.565         |  45.11  |   1.77   |            G           |     3 3/8     |       45 1/4       |     —    |      5     |   5 1/4  |
|       14.45       |          0.569         |  45.40  |   1.79   |          G 1/4         |     3 1/2     |          —         |  14 1/2  |      —     |     —    |
|       14.56       |          0.573         |  45.74  |   1.80   |          G 1/2         |     3 5/8     |          —         |     —    |      6     |     —    |
|       14.65       |          0.577         |  46.02  |   1.81   |            H           |     3 3/4     |       46 1/2       |     —    |      —     |   6 1/2  |
|       14.86       |          0.585         |  46.68  |   1.84   |          H 1/2         |       4       |          —         |    15    |      7     |     —    |
|       15.04       |          0.592         |  47.25  |   1.86   |            I           |     4 1/4     |       47 3/4       |     —    |      —     |   7 3/4  |
|       15.27       |          0.601         |  47.97  |   1.89   |          I 1/2         |     4 1/2     |          —         |  15 1/4  |      8     |     —    |
|       15.40       |          0.606         |  48.38  |   1.90   |            J           |     4 5/8     |         49         |  15 1/2  |      —     |     9    |
|       15.53       |          0.611         |  48.79  |   1.92   |          J 1/4         |     4 3/4     |          —         |     —    |      —     |     —    |
|       15.70       |          0.618         |  49.32  |   1.94   |          J 1/2         |       5       |          —         |  15 3/4  |      9     |     —    |
|       15.80       |          0.622         |  49.64  |   1.95   |            K           |     5 1/8     |         50         |     —    |      —     |    10    |
|       15.90       |          0.626         |  49.95  |   1.97   |          K 1/4         |     5 1/4     |          —         |     —    |      —     |     —    |
|       16.00       |          0.630         |  50.27  |   1.98   |          K 1/2         |     5 3/8     |          —         |     —    |     10     |     —    |
|       16.10       |          0.634         |  50.58  |   1.99   |            L           |     5 1/2     |       51 3/4       |    16    |      —     |  11 3/4  |
|       16.30       |          0.642         |  51.21  |   2.02   |          L 1/4         |     5 3/4     |          —         |     —    |      —     |     —    |
|       16.41       |          0.646         |  51.55  |   2.03   |          L 1/2         |     5 7/8     |          —         |     —    |      —     |     —    |
|       16.51       |          0.650         |  51.87  |   2.04   |            M           |       6       |       52 3/4       |  16 1/2  |     12     |  12 3/4  |
|       16.71       |          0.658         |  52.50  |   2.07   |          M 1/2         |     6 1/4     |          —         |     —    |      —     |     —    |
|       16.92       |          0.666         |  53.16  |   2.09   |            N           |     6 1/2     |         54         |    17    |     13     |    14    |
|       17.13       |          0.674         |  53.82  |   2.12   |          N 1/2         |     6 3/4     |          —         |     —    |      —     |     —    |
|       17.35       |          0.683         |  54.51  |   2.15   |            O           |       7       |       55 1/4       |  17 1/4  |     14     |  15 1/4  |
|       17.45       |          0.687         |  54.82  |   2.16   |          O 1/2         |     7 1/4     |          —         |     —    |      —     |     —    |
|       17.75       |          0.699         |  55.76  |   2.20   |            P           |     7 1/2     |       56 1/2       |  17 3/4  |     15     |  16 1/2  |
|       17.97       |          0.707         |  56.45  |   2.22   |          P 1/2         |     7 3/4     |          —         |     —    |      —     |     —    |
|       18.19       |          0.716         |  57.15  |   2.25   |            Q           |       8       |       57 3/4       |    18    |     16     |  17 3/4  |
|       18.35       |          0.722         |  57.65  |   2.27   |          Q 1/2         |     8 1/4     |          —         |     —    |      —     |     —    |
|       18.53       |          0.729         |  58.21  |   2.29   |          Q 3/4         |     8 1/2     |          —         |  18 1/2  |     17     |     —    |
|       18.61       |          0.733         |  58.47  |   2.30   |            R           |     8 5/8     |         59         |     —    |      —     |    19    |
|       18.69       |          0.736         |  58.72  |   2.31   |          R 1/4         |     8 3/4     |          —         |     —    |      —     |     —    |
|       18.80       |          0.740         |  59.06  |   2.32   |          R 1/2         |     8 7/8     |          —         |     —    |      —     |     —    |
|       18.89       |          0.748         |  59.34  |   2.35   |          R 3/4         |       9       |          —         |    19    |     18     |     —    |
|       19.10       |          0.752         |  60.00  |   2.36   |            S           |     9 1/8     |       60 1/4       |     —    |      —     |  20 1/4  |
|       19.22       |          0.757         |  60.38  |   2.38   |          S 1/4         |     9 1/4     |          —         |     —    |      —     |     —    |
|       19.31       |          0.760         |  60.66  |   2.39   |          S 1/2         |     9 3/8     |          —         |     —    |      —     |     —    |
|       19.41       |          0.764         |  60.98  |   2.40   |          S 3/4         |     9 1/2     |          —         |  19 1/2  |     19     |     —    |
|       19.51       |          0.768         |  61.29  |   2.41   |            T           |     9 5/8     |       61 1/2       |     —    |      —     |  21 1/2  |
|       19.62       |          0.772         |  61.64  |   2.43   |          T 1/4         |     9 3/4     |          —         |     —    |      —     |     —    |
|       19.84       |          0.781         |  62.33  |   2.45   |          T 1/2         |       10      |          —         |    20    |     20     |     —    |
|       20.02       |          0.788         |  62.89  |   2.48   |            U           |     10 1/4    |       62 3/4       |     —    |     21     |  22 3/4  |
|       20.20       |          0.797         |  63.46  |   2.50   |          U 1/2         |     10 1/2    |          —         |  20 1/4  |     22     |     —    |
|       20.32       |          0.800         |  63.84  |   2.51   |            V           |     10 5/8    |         63         |     —    |      —     |  23 3/4  |
|       20.44       |          0.805         |  64.21  |   2.53   |          V 1/4         |     10 3/4    |          —         |     —    |      —     |     —    |
|       20.68       |          0.814         |  64.97  |   2.56   |          V 1/2         |       11      |          —         |  20 3/4  |     23     |     —    |
|       20.76       |          0.817         |  65.22  |   2.57   |            W           |     11 1/8    |         65         |     —    |      —     |    25    |
|       20.85       |          0.821         |  65.50  |   2.58   |          W 1/4         |     11 1/4    |          —         |     —    |      —     |     —    |
|       20.94       |          0.824         |  65.78  |   2.59   |          W 1/2         |     11 3/8    |          —         |     —    |      —     |     —    |
|       21.08       |          0.830         |  66.22  |   2.61   |          W 3/4         |     11 1/2    |          —         |    21    |     24     |     —    |
|       21.18       |          0.834         |  66.54  |   2.62   |            X           |     11 5/8    |       66 1/4       |     —    |      —     |  26 1/4  |
|       21.24       |          0.836         |  66.73  |   2.63   |          X 1/4         |     11 3/4    |          —         |     —    |      —     |     —    |
|       21.30       |          0.839         |  66.92  |   2.64   |          X 1/2         |     11 7/8    |          —         |     —    |      —     |     —    |
|       21.49       |          0.846         |  67.51  |   2.66   |            Y           |       12      |       67 1/2       |  21 1/4  |     25     |  27 1/2  |
|       21.69       |          0.854         |  68.14  |   2.68   |          Y 1/2         |     12 1/4    |          —         |     —    |      —     |     —    |
|       21.89       |          0.862         |  68.77  |   2.71   |            Z           |     12 1/2    |       68 3/4       |  21 3/4  |     26     |  28 3/4  |
|       22.10       |          0.870         |  69.43  |   2.73   |         Z +1/2         |     12 3/4    |          —         |     —    |      —     |     —    |
|       22.33       |          0.879         |  70.15  |   2.76   |           Z+1          |       13      |          —         |    22    |     27     |     —    |
|       22.60       |          0.890         |  71.00  |   2.80   |          Z+1.5         |      13.5     |          —         |     —    |      —     |     —    |
|       22.69       |          0.893         |  71.28  |   2.81   |           Z+2          |       —       |          —         |     —    |      —     |     —    |
|       22.92       |          0.902         |  72.00  |   2.83   |          Z+2.5         |       —       |          —         |     —    |      —     |     —    |
|       23.06       |          0.908         |  72.45  |   2.85   |           Z+3          |       —       |          —         |     —    |      —     |     —    |
|       23.24       |          0.915         |  73.01  |   2.87   |          Z+3.5         |       —       |          —         |     —    |      —     |     —    |
|       23.47       |          0.924         |  73.73  |   2.90   |           Z+4          |       —       |          —         |     —    |      —     |     —    |
|       23.55       |          0.927         |  73.98  |   2.91   |          Z+4.5         |       —       |          —         |     —    |      —     |     —    |
|       23.87       |          0.940         |  74.99  |   2.95   |           Z+5          |       —       |          —         |     —    |      —     |     —    |
|       24.27       |          0.956         |  76.25  |   3.00   |           Z+6          |       —       |          —         |     —    |      —     |     —    |
