| Tom Wood Sizing | Inside Diameter (mm) | Inside Diameter (inches) | Inside Circ (mm) | Inside Circ (inches) | British & Australian | US & Canada | French & Russian | Italian | Japanese | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 42 | 13,4 | 0,528 | 42,13 | 1,66 | D 1/2 | 2 1/4 | 42 | 2 | 2,5 |
| 2 | 44 | 14,0 | 0,553 | 44,14 | 1,74 | F | 3 | 44 | 4 | 4 |
| 3 | 46 | 14,5 | 0,571 | 45,74 | 1,80 | G 1/2 | 3 5/8 | 46 | 8 | 6 |
| 4 | 48 | 15,3 | 0,602 | 47,97 | 1,89 | I 1/2 | 4 1/2 | 48 | 9 | 8 |
| 5 | 50 | 15,9 | 0,626 | 49,95 | 1,97 | K 1/4 | 5 1/4 | 50 | 11 | 10 |
| 6 | 52 | 16,5 | 0,650 | 51,87 | 2,04 | M | 6 | 52 3/4 | 13 | 12 |
| 7 | 54 | 17,2 | 0,677 | 53,82 | 2,12 | N 1/2 | 6 3/4 | 54 | 15 | 14 |
| 8 | 56 | 17,8 | 0,700 | 55,76 | 2,20 | P | 7 1/2 | 56 1/2 | 17/18 | 15,5 |
| 9 | 58 | 18,5 | 0,728 | 58,21 | 2,29 | Q 3/4 | 8 1/2 | 58 | 18/19 | 18 |
| 10 | 60 | 19,2 | 0,756 | 60,38 | 2,38 | S 1/4 | 9 1/4 | 60 1/2 | 20 | 19 |
| 11 | 62 | 19,8 | 0,780 | 62,33 | 2,45 | T 1/2 | 10 | 62 | 22 | 21 |
| 12 | 64 | 20,4 | 0,804 | 64,21 | 2,53 | V 1/4 | 10 3/4 | 64 | 23 | 23 |
| 13 | 66 | 21,0 | 0,826 | 66,22 | 2,61 | W 1/2 | 11 1/2 | 66 | 25 | 24 |
