You can follow the next steps to chose the ring size that fits you most:
- Take a ring that you already have and that fits you perfectly.
- Measure the ring's inner diameter.
- In the following table, depending on the measurement obtained, you will find your size and the different equivalences depending on the country.
| DIAMETER (mm) | 14.86 | 15.70 | 16.51 | 17.35 | 18.19 | 18.89 | 19.84 | 20.68 |
| Spain | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 |
| USA & CANADA | US 4 | US 5 | US 6 | US 7 | US 8 | US 9 | US 10 | US 11 |
| UK & AUSTRALIA | H 1/2 | J 1/2 | M | O | Q | R 3/4 | T 1/2 | V 1/2 |
| European Union | 48 | 50 | 52 | 54 | 56 | 58 | 60 | 62 |
Diameter from 14.50 mm to 15.50 mm
| Spain: | 8 |
| USA & Canada: | US4 |
| UK & Australia: | H 1/2 |
| European Union: | 48 |
Diameter from 15.50 mm to 16.40 mm
| Spain: | 10 |
| USA & Canada: | US5 |
| UK & Australia: | J 1/2 |
| European Union: | 50 |
Diameter from 16.40 mm to 17.20 mm
| Spain: | 12 |
| USA & Canada: | US6 |
| UK & Australia: | M |
| European Union: | 52 |
Diameter from 17.20 mm to 18 mm
| Spain: | 14 |
| USA & Canada: | US7 |
| UK & Australia: | O |
| European Union: | 54 |
Diameter from 18 mm to 18.50 mm
| Spain: | 16 |
| USA & Canada: | US8 |
| UK & Australia: | Q |
| European Union: | 56 |
Diameter to 18.50 mm a 19.50 mm
| Spain: | 18 |
| USA & Canada: | US9 |
| UK & Australia: | R 3/4 |
| European Union: | 58 |
Diameter from 19.50 mm to 20.40 mm
| Spain: | 20 |
| USA & Canada: | US10 |
| UK & Australia: | T 1/2 |
| European Union: | 60 |
Diameter from 20.40 mm to 21 mm
| Spain: | 22 |
| USA & Canada: | US11 |
| UK & Australia: | V 1/2 |
| European Union: | 62 |