Ring Size Converter
Convert ring sizes between US, UK and EU sizing, or measure a ring you already own to find your size.
- Runs on your device
- No watermark
- Free, no signup needed
- Available offline
Measure your foot instead
| US & Canada | UK | EU | Inches | cm |
|---|---|---|---|---|
| 4 | 2 | 35 | 8.2 | 20.8 |
| 4.5 | 2.5 | 35 | 8.3 | 21.3 |
| 5 | 3 | 35–36 | 8.5 | 21.6 |
| 5.5 | 3.5 | 36 | 8.8 | 22.2 |
| 6 | 4 | 36–37 | 8.9 | 22.5 |
| 6.5 | 4.5 | 37 | 9.1 | 23 |
| 7 | 5 | 37–38 | 9.3 | 23.5 |
| 7.5 | 5.5 | 38 | 9.4 | 23.8 |
| 8 | 6 | 38–39 | 9.5 | 24.1 |
| 8.5 | 6.5 | 39 | 9.7 | 24.6 |
| 9 | 7 | 39–40 | 9.9 | 25.1 |
| 9.5 | 7.5 | 40 | 10 | 25.4 |
| 10 | 8 | 40–41 | 10.2 | 25.9 |
| 10.5 | 8.5 | 41 | 10.3 | 26.2 |
| 11 | 9 | 41–42 | 10.5 | 26.7 |
| 11.5 | 9.5 | 42 | 10.7 | 27.1 |
| 12 | 10 | 42–43 | 10.9 | 27.6 |
Sizes vary between brands — always check the brand's own chart before buying. Source: Zappos shoe size conversion. Browse shoes reviews →
Measure your foot instead
| US & Canada | UK | EU | Inches | cm |
|---|---|---|---|---|
| 6 | 5.5 | 39 | 9.3 | 23.5 |
| 6.5 | 6 | 39 | 9.5 | 24.1 |
| 7 | 6.5 | 40 | 9.6 | 24.4 |
| 7.5 | 7 | 40–41 | 9.8 | 24.8 |
| 8 | 7.5 | 41 | 9.9 | 25.4 |
| 8.5 | 8 | 41–42 | 10.1 | 25.7 |
| 9 | 8.5 | 42 | 10.3 | 26 |
| 9.5 | 9 | 42–43 | 10.4 | 26.7 |
| 10 | 9.5 | 43 | 10.6 | 27 |
| 10.5 | 10 | 43–44 | 10.8 | 27.3 |
| 11 | 10.5 | 44 | 10.9 | 27.9 |
| 11.5 | 11 | 44–45 | 11.1 | 28.3 |
| 12 | 11.5 | 45 | 11.3 | 28.6 |
| 13 | 12.5 | 46 | 11.6 | 29.4 |
| 14 | 13.5 | 47 | 11.9 | 30.2 |
| 15 | 14.5 | 48 | 12.2 | 31 |
| 16 | 15.5 | 49 | 12.5 | 31.8 |
Sizes vary between brands — always check the brand's own chart before buying. Source: Zappos shoe size conversion. Browse shoes reviews →
| Letter | US | UK / AU / NZ | Italy | France | Germany | Japan |
|---|---|---|---|---|---|---|
| S | 2 | 6 | 38 | 34 | 32 | 7 |
| S | 4 | 8 | 40 | 36 | 34 | 9 |
| M | 6 | 10 | 42 | 38 | 36 | 11 |
| M | 8 | 12 | 44 | 40 | 38 | 13 |
| L | 10 | 14 | 46 | 42 | 40 | 15 |
| L | 12 | 16 | 48 | 44 | 42 | 17 |
| XL / 1X | 14 | 18 | 50 | 46 | 44 | 19 |
| 1X / 2X | 16 | 20 | 52 | 48 | 46 | 21 |
| 2X | 18 | 22 | 54 | 50 | 48 | 23 |
| 3X | 20 | 24 | 56 | 52 | 50 | 25 |
| 3X | 22 | 26 | 58 | 54 | 52 | 27 |
| 4X | 24 | 28 | 60 | 56 | 54 | 29 |
Sizes vary between brands — always check the brand's own chart before buying. Source: Sizeguide.net women's international size chart. Browse clothing reviews →
Measure a ring instead
| US | UK | EU | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|
| 3 | F | 44 | 14.1 | 44.2 |
| 3.25 | F½ | 45 | 14.3 | 44.8 |
| 3.5 | G | 45.5 | 14.5 | 45.5 |
| 3.75 | G½ | 46 | 14.7 | 46.1 |
| 4 | H | 46.5 | 14.9 | 46.7 |
| 4.25 | H½ | 47.5 | 15.1 | 47.4 |
| 4.5 | I | 48 | 15.3 | 48 |
| 4.75 | J | 48.5 | 15.5 | 48.7 |
| 5 | J½ | 49.5 | 15.7 | 49.3 |
| 5.25 | K | 50 | 15.9 | 49.9 |
| 5.5 | K½ | 50.5 | 16.1 | 50.6 |
| 5.75 | L | 51 | 16.3 | 51.2 |
| 6 | L½ | 52 | 16.5 | 51.8 |
| 6.25 | M | 52.5 | 16.7 | 52.5 |
| 6.5 | M½ | 53 | 16.9 | 53.1 |
| 6.75 | N | 54 | 17.1 | 53.8 |
| 7 | N½ | 54.5 | 17.3 | 54.4 |
| 7.25 | O | 55 | 17.5 | 55 |
| 7.5 | O½ | 55.5 | 17.7 | 55.7 |
| 7.75 | P | 56.5 | 17.9 | 56.3 |
| 8 | P½ | 57 | 18.1 | 56.9 |
| 8.25 | Q | 57.5 | 18.3 | 57.6 |
| 8.5 | Q½ | 58 | 18.5 | 58.2 |
| 8.75 | R | 59 | 18.7 | 58.9 |
| 9 | R½ | 59.5 | 18.9 | 59.5 |
| 9.25 | S | 60 | 19.2 | 60.1 |
| 9.5 | S½ | 61 | 19.4 | 60.8 |
| 9.75 | T | 61.5 | 19.6 | 61.4 |
| 10 | T½ | 62 | 19.8 | 62.1 |
| 10.25 | U | 62.5 | 20 | 62.7 |
| 10.5 | U½ | 63.5 | 20.2 | 63.3 |
| 10.75 | V | 64 | 20.4 | 64 |
| 11 | V½ | 64.5 | 20.6 | 64.6 |
| 11.25 | W | 65 | 20.8 | 65.2 |
| 11.5 | W½ | 66 | 21 | 65.9 |
| 11.75 | X | 66.5 | 21.2 | 66.5 |
| 12 | X½ | 67 | 21.4 | 67.2 |
| 12.25 | Y | 68 | 21.6 | 67.8 |
| 12.5 | Z | 68.5 | 21.8 | 68.4 |
| 12.75 | Z½ | 69 | 22 | 69.1 |
| 13 | Z1 | 69.5 | 22.2 | 69.7 |
Sizes vary between brands — always check the brand's own chart before buying. Source: 25karats ring size conversion chart. Browse rings reviews →
How to use it
- Pick the size system you know.
- Choose your size — or measure yourself instead.
- Read your size in every other system, then check the brand’s own chart.
Questions
How do I find my ring size at home?
Measure the inside diameter of a ring that fits, in millimeters, and enter it here. Or wrap a strip of paper around your finger, mark where it overlaps, and enter that length with the unit set to circumference.
What is a US size 7 ring in UK and EU sizes?
A US 7 is a UK N½ and an EU 54.5, with an inside diameter of about 17.3 mm.
Why do sizes differ between jewelers?
Ring sizes are standardized, but band width changes the fit: wide bands feel tighter, so many jewelers suggest going up a quarter or half size for them.
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