Ring Size Conversion Chart
Ring Size Conversion Calculators
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Choose the calculator specific to your region for the most accurate conversions, or use the general calculator for worldwide compatibility.
| Ring Diameter (MM) | USA/Canada | United Kingdom | Europe | Germany | Japan | Switzerland |
|---|---|---|---|---|---|---|
| 14.0 mm | 3 | F | 44 | 14 | 4 | 4 |
| 14.4 mm | 3.5 | G | 45.25 | 14.5 | 5.5 | 6.33 |
| 14.8 mm | 4 | H.5 | 46.5 | 15 | 7 | 6.5 |
| 15.2 mm | 4.5 | I.5 | 47.75 | 15.25 | 8 | 8 |
| 15.6 mm | 5 | J.5 | 49 | 15.75 | 9 | 9.5 |
| 16.0 mm | 5.5 | L | 50.75 | 16 | 10.5 | 10.75 |
| 16.5 mm | 6 | M | 51.5 | 16.5 | 12 | 12.75 |
| 16.9 mm | 6.5 | N | 52.75 | 17 | 13 | 14 |
| 17.3 mm | 7 | O | 54 | 17.25 | 14 | 15.25 |
| 17.7 mm | 7.5 | P | 55.25 | 17.75 | 15 | 16.5 |
| 18.2 mm | 8 | Q | 56.75 | 18 | 16 | 17.75 |
| 18.6 mm | 8.5 | Q.5 | 58 | 18.5 | 17 | 18.5 |
| 19.0 mm | 9 | R.5 | 59.25 | 19 | 18 | 20 |
| 19.4 mm | 9.5 | S.5 | 60.75 | 19.5 | 19 | 21 |
| 19.8 mm | 10 | T.5 | 61.75 | 20 | 20 | 21.75 |
| 20.2 mm | 10.5 | U.5 | 62.75 | 20.75 | 22 | 22.75 |
| 20.6 mm | 11 | V.5 | 64.25 | 20.75 | 23 | 24 |
| 21.0 mm | 11.5 | W.5 | 66 | 21 | 24 | 25.75 |
| 21.4 mm | 12 | Y | 67.25 | 21.25 | 25 | 27.25 |
| 21.8 mm | 12.5 | Z | 68 | 21.75 | 26 | 28.75 |
| 22.2 mm | 13 | Z + 1 | 69 | 22 | 27 | 29.25 |
| 22.6 mm | 13.5 | Z + 1.5 | 71 | 22.6 | 28 | 31 |