Europe (ISO 8653) ring sizes
ISO 8653 defines a ring size as the inside circumference in millimetres, rounded to a whole millimetre, so size 54 is a ring 54 mm round and 17.2 mm across.
Defined by a published standard.
Where it is used: France, Austria, Belgium, Denmark, Finland, Norway, Sweden
Europe (ISO 8653) size table
| Europe (ISO 8653) size | Inside Ø mm | Circumference mm | Nearest US | Nearest UK | Nearest ISO |
|---|---|---|---|---|---|
| 44 | 14.0 | 44.0 | ≈ 3 | ≈ F | 44 |
| 45 | 14.3 | 45.0 | ≈ 3.25 | G | 45 |
| 46 | 14.6 | 46.0 | 3.75 | ≈ H | 46 |
| 47 | 15.0 | 47.0 | ≈ 4 | H½ | 47 |
| 48 | 15.3 | 48.0 | 4.5 | I½ | 48 |
| 49 | 15.6 | 49.0 | ≈ 5 | ≈ J | 49 |
| 50 | 15.9 | 50.0 | 5.25 | K | 50 |
| 51 | 16.2 | 51.0 | ≈ 5.75 | ≈ L | 51 |
| 52 | 16.6 | 52.0 | 6 | L½ | 52 |
| 53 | 16.9 | 53.0 | 6.5 | M½ | 53 |
| 54 | 17.2 | 54.0 | ≈ 6.75 | ≈ N | 54 |
| 55 | 17.5 | 55.0 | 7.25 | O | 55 |
| 56 | 17.8 | 56.0 | ≈ 7.5 | ≈ P | 56 |
| 57 | 18.1 | 57.0 | 8 | P½ | 57 |
| 58 | 18.5 | 58.0 | ≈ 8.5 | Q½ | 58 |
| 59 | 18.8 | 59.0 | 8.75 | ≈ R | 59 |
| 60 | 19.1 | 60.0 | ≈ 9.25 | S | 60 |
| 61 | 19.4 | 61.0 | ≈ 9.5 | ≈ T | 61 |
| 62 | 19.7 | 62.0 | 10 | T½ | 62 |
| 63 | 20.1 | 63.0 | ≈ 10.25 | U½ | 63 |
| 64 | 20.4 | 64.0 | 10.75 | ≈ V | 64 |
| 65 | 20.7 | 65.0 | ≈ 11.25 | W | 65 |
| 66 | 21.0 | 66.0 | 11.5 | ≈ X | 66 |
| 67 | 21.3 | 67.0 | ≈ 12 | X½ | 67 |
| 68 | 21.6 | 68.0 | ≈ 12.25 | Y½ | 68 |
| 69 | 22.0 | 69.0 | 12.75 | ≈ Z | 69 |
| 70 | 22.3 | 70.0 | ≈ 13 | Z+1 | 70 |
| 71 | 22.6 | 71.0 | 13.5 | ≈ Z+2 | 71 |
| 72 | 22.9 | 72.0 | ≈ 14 | Z+2½ | 72 |
About Europe (ISO 8653) sizes
Europe (ISO 8653) is a ring sizing system used in France, Austria, Belgium and the Nordic countries. Brands that number rings by circumference also use it. For example, US 7 corresponds to ISO 54 in the table, while its listed circumference is 54.4 mm.
ISO 8653:2016 defines this system, and the size number follows the inside circumference in millimetres, rounded to a whole millimetre. A diameter uses a different measure: for example, size 54 is 17.2 mm across. A draft revision exists, so check which edition is current when you need the standard’s formal details.
Use the table to compare an ISO size with sizes in other systems, then check the shop’s own chart before buying because conversions can differ. Measure the inside of a ring you already own, and use RingSteps’ converter or printable sizer to help compare sizes.
Sources
- ISO 8653:2016 Jewellery: Ring-sizes: Definition, measurement and designation (ISO (catalogue page by iTeh Standards)) Checked November 10, 2026
- Ring size (Wikipedia) Checked November 10, 2026