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Ring Size Guide Tool
Convert between circumference, diameter, and international ring size standards. Enter one value to see all conversions.
Circumference
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mm
Diameter
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mm
UK/Europe/Australia
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US/India
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Ring Size Conversion Chart
| Circumference (mm) | Diameter (mm) | UK/Europe/Australia | US/India |
|---|
How to Measure Your Ring Size
- Wrap a piece of string or paper around the base of your finger.
- Mark the point where the ends meet.
- Measure the length in millimeters to get the circumference.
- Use the circumference to find your ring size in the table above.
- For the most accurate measurement, visit a jeweler.