💍 Converter
Ring Size Converter
Convert between US, UK/AU, EU, and millimeter ring sizes. Find your size from diameter or circumference.
Ring Size Equivalents
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Full ring size chart
| US | UK / AU | EU / German | Diameter (mm) | Circumference (mm) |
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Find your ring size at home
Method 1 — String: Wrap a thin strip of paper or string around your finger. Mark where it overlaps. Measure the length in mm = circumference.
Method 2 — Existing ring: Measure the inside diameter with a ruler in mm, then find it in the chart above.