Use the table below to find your ring size.
To find the perfect ring size for someone else, look at their other jewellery or ask their family or friends. If in doubt, choose a larger size and get it resized later.
Ring chart
| Inside circumference (mm) | Inside diameter (mm) | UK, Aust, NZ ring size |
| 37.5 | 12 | A |
| 38.3 | 12.2 | A 1/2 |
| 38.9 | 12.4 | B |
| 39.6 | 12.6 | B 1/2 |
| 40.2 | 12.8 | C |
| 40.8 | 13 | C 1/2 |
| 41.5 | 13.2 | D |
| 42.1 | 13.4 | D 1/2 |
| 42.8 | 13.6 | E |
| 43.5 | 13.8 | E 1/2 |
| 44.1 | 14.1 | F |
| 44.5 | 14.2 | F 1/2 |
| 45.1 | 14.4 | G |
| 45.7 | 14.6 | G 1/2 |
| 46 | 14.7 | H |
| 46.7 | 14.9 | H 1/2 |
| 47.3 | 15 | I |
| 48 | 15.3 | I 1/2 |
| 48.4 | 15.4 | J |
| 49.3 | 15.7 | J 1/2 |
| 49.6 | 15.8 | K |
| 50.3 | 16 | K 1/2 |
| 50.6 | 16.1 | L |
| 51.6 | 16.4 | L 1/2 |
| 51.9 | 16.5 | M |
| 52.5 | 16.7 | M 1/2 |
| 53.2 | 16.9 | N |
| 53.8 | 17.1 | N 1/2 |
| 54.5 | 17.4 | O |
| 54.8 | 17.5 | O 1/2 |
| 55.8 | 17.8 | P |
| 56.5 | 18 | P 1/2 |
| 57.2 | 18.2 | Q |
| 57.7 | 18.4 | Q 1/2 |
| 58.5 | 18.6 | R |
| 59.1 | 18.8 | R 1/2 |
| 60 | 19.1 | S |
| 60.7 | 19.3 | S 1/2 |
| 61.3 | 19.5 | T |
| 62.3 | 19.8 | T 1/2 |
| 62.9 | 20 | U |
| 63.5 | 20.2 | U 1/2 |
| 63.8 | 20.3 | V |
| 65 | 20.7 | V 1/2 |
| 65.2 | 20.8 | W |
| 65.8 | 20.9 | W 1/2 |
| 66.5 | 21.2 | X |
| 66.9 | 21.3 | X 1/2 |
| 67.5 | 21.5 | Y |
| 68.1 | 21.7 | Y 1/2 |
| 68.8 | 21.9 | Z |
