Ring Size Converter
Convert ring size (US/Canada,UK,Diameter (mm),Circumference (mm)) instantly in your browser — nothing uploaded.
| US/Canada | UK | Diameter (mm) | Circumference (mm) |
|---|---|---|---|
| 3 | F | 14.1 | 44.2 |
| 4 | H | 14.9 | 46.8 |
| 5 | J | 15.7 | 49.3 |
| 6 | L | 16.5 | 51.9 |
| 7 | N | 17.3 | 54.4 |
| 8 | P | 18.1 | 57 |
| 9 | R | 18.9 | 59.5 |
| 10 | T | 19.8 | 62.1 |
| 11 | V | 20.6 | 64.6 |
| 12 | X | 21.4 | 67.2 |
| 13 | Z | 22.2 | 69.7 |
Widely-cited jewelry-industry chart. For an exact fit, measure with a physical ring sizer — finger size varies slightly through the day.
How the Ring Size Converter Works
Converts jewelry ring sizes across US/Canada, UK/Australia/NZ, European (EU), and Japanese standards based on inside diameter and circumference millimeters.
Conversion Example
A US size 7 ring has an inside diameter of 17.3 mm, equivalent to a UK size N and EU size 54.
Frequently Asked Questions
How is ring size measured?
Ring sizes correspond directly to either inner circumference (EU system in mm) or inner diameter.