Decupati o banda de hartie. Aplicati banda in jurul degetului. Masurati lungimea benzii in mm. Lungimea benzii de hartie = Marimea inelului De exemplu: 53.8 mm inseamna ca trebuie sa alegeti marimea 54.
Luati un inel pe care il aveti si cu o rigla ii masurati diametru. Diametrul il inmultiti cu 3.14. Exemplu: Diametrul 17 x 3,14 =53,38 mm. Puteti alege marimea 53 sau chiar 54, diferenta de o marime fiind foarte mica.
| marime(inches) | marime(mm) | diametru (mm) | marime U.S.A. | marime British |
|---|---|---|---|---|
| 1 7/8 | 48 | 15.27 | 4 1/2 | I - 1/2 |
| 1 15/16 | 49 | 15.7 | 5 | J 1/2 |
| 2 | 51 | 16.1 | 5 1/2 | L |
| 2 1/16 | 52 | 16.51 | 6 | M |
| 2 1/8 | 53 | 16.92 | 6 1/2 | N |
| 2 3/16 | 55 | 17.35 | 7 | O |
| 2 1/4 | 56 | 17.75 | 7 1/2 | P |
| 2 5/16 | 57 | 18.19 | 8 | Q |
| 2 3/8 | 58 | 18.53 | 8 1/2 | Q 1/2 |
| 2 7/16 | 59 | 18.89 | 9 | R 1/2 |
| 2 1/2 | 61 | 19.41 | 9 1/2 | S 1/2 |
| 2 9/16 | 62 | 19.84 | 10 | T 1/2 |
| 2 5/8 | 63 | 20.2 | 10 1/2 | U 1/2 |
| 2 11/16 | 65 | 20.68 | 11 | V 1/2 |
| 2 3/4 | 66 | 21.08 | 11 1/2 | W 1/2 |
| 2 13/16 | 68 | 21.49 | 12 | Y |
| 2 7/8 | 69 | 21.89 | 12 1/2 | Z |
| 2 15/16 | 70 | 22.33 | 13 | -- |