Use the chart below to find your Italian ring size.
To find out the correct diameter, use a ruler to measure the internal diameter of a ring of your size as you see in the figure. Once you have the measure in millimetres, compare the value with the conversion table.
| MM | IT | FR | US | UK |
| 14,3 | 5 | 45 | – | – |
| 14,6 | 6 | 46 | – | H |
| 14,9 | 7 | 47 | – | I |
| 15,3 | 8 | 48 | 4,5 | I-1/2 |
| 15,6 | 9 | 49 | – | J |
| 16 | 10 | 50 | – | K |
| 16,2 | 11 | 51 | – | L-1/2 |
| 16,5 | 12 | 52 | – | – |
| 16,8 | 13 | 53 | 6,5 | N |
| 17,2 | 14 | 54 | – | – |
| 17,4 | 15 | 55 | – | – |
| 17,8 | 16 | 56 | 7,5 | P |
| 18,1 | 17 | 57 | 8 | Q |
| 18,5 | 18 | 58 | – | – |
| 18,8 | 19 | 59 | – | R |
| 19,2 | 20 | 60 | – | S |
| 19,5 | 21 | 61 | 9,5 | – |
| 19,8 | 22 | 62 | 10 | T-1/2 |
| 20 | 23 | 63 | – | – |
| 20,4 | 24 | 64 | – | V |
| 20,6 | 25 | 65 | 11 | W |