The table below provides an overview of all international conversion measures, so you can choose the most suitable measure or convert it to “Italian measurement”.
| Italian measure | German measure | French measure | English measure | American measure | Internal diameter (mm) | Internal circumference (mm) |
| 4 | n.d | 4,5 | F | 3 | 14,00 – 14,10 | 44,00 – 44,3 |
| 5 | n.d. | 4,5 | F | 3 | 14,20 – 14,40 | 44,60 – 45,20 |
| 6 | n.d. | 5,5 | G | 3,5 | 14,50 – 14,70 | 45,60 – 46,20 |
| 7 | n.d. | 7 | H | 4 | 14,80 – 15,10 | 46,50 – 47,40 |
| 8 | n.d. | 8 | I | 4,5 | 15,20 – 15,40 | 47,80 – 48,40 |
| 9 | 16 | 9 | J | 5 | 15,50 – 15,70 | 48,70 – 49,30 |
| 10 | 16 | 9,5 | J | 5 | 15,80 – 16,00 | 49,60 – 50, 30 |
| 11 | 16 | 10,5 | K | 5,5 | 16,10 – 16,30 | 50,60 – 51,20 |
| 12 | 16 | 12 | L | 6 | 16,40 – 16,60 | 51,50 – 52,20 |
| 13 | 17 | 12 | L | 6 | 16,70 – 17,00 | 52,50 – 53,40 |
| 14 | 17 | 13,5 | M | 6,5 | 17,10 – 17,30 | 53,70 – 54,30 |
| 15 | 17 | 14,5 | N | 7 | 17,40 – 17,60 | 54,70 – 55,30 |
| 16 | 17 | 16 | O | 7,5 | 17,70 – 17,90 | 55,60 – 56,20 |
| 17 | 18 | 16,5 | P | 8 | 18,00 – 18,20 | 56,50 – 57,20 |
| 18 | 18 | 18,5 | Q | 8,5 | 18,30 – 18,60 | 57,50 – 58,40 |
| 19 | 19 | 18,5 | Q | 8,5 | 18,70 – 18,90 | 58,70 – 59,40 |
| 20 | 19 | 19,5 | R | 9 | 19,00 – 19,20 | 59,70 – 60,30 |
| 21 | 19 | 19,5 | R | 9 | 19,30 – 19,50 | 60,60 – 61,30 |
| 22 | 20 | 21 | S | 9,5 | 19,60 – 19,80 | 61,60 – 62,20 |
| 23 | 20 | 22,5 | T | 10 | 19,90 – 20,10 | 62,50 – 63,10 |
| 24 | 20 | 23 | n.d. | n.d. | 20,20 – 20,50 | 63,50 – 64,40 |
| 25 | 20 | 23,5 | U | 10,5 | 20,60 – 20,80 | 64,70 – 65,30 |
| 26 | 21 | 25 | V | 11 | 20,90 – 21,10 | 65,70 – 66,30 |
| 27 | 21 | 26 | W | 11,5 | 21,20 – 21,50 | 66,30 – 67,50 |
| 28 | 21 | 27 | X | 12 | 21,60 – 21,80 | 67,90 – 68,50 |
| 29 | 22 | 27,5 | Y | 12,5 | 21,90 – 22,10 | 68,80 – 69,40 |
| 30 | 22,5 | 29 | Z | 13 | 22,20 – 22,40 | 69,70 – 70,40 |
| 31 | 22,5 | 30 | Z | 13 | 22,50 – 22,70 | 70,70 – 71,30 |
If you have doubts, do not hesitate to contact us.
