Free Tool
Ring Size Guide
Find your perfect ring size with our international converter and printable ring sizer. Supports US, UK, EU, and Asian sizing standards.
Interactive Converter
Ring Size Converter
Enter your ring size in any system below. The converter will instantly show the equivalent sizes in all other standards.
Your Ring Size
US
UK
EU
JP / CN
Diameter
mm
Enter a size in any field above to see conversions.
Complete Reference
International Ring Size Chart
| US / Canada | UK / Australia | Europe | Japan / China | Inner Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|---|
| 3 | F | 44 | 4 | 14.05 | 44.14 |
| 3.5 | F½ | 45.5 | 5 | 14.45 | 45.40 |
| 4 | H | 46.5 | 7 | 14.86 | 46.68 |
| 4.5 | I | 47.8 | 8 | 15.27 | 47.97 |
| 5 | J½ | 49 | 9 | 15.70 | 49.32 |
| 5.5 | K½ | 50.3 | 10 | 16.10 | 50.58 |
| 6 | L½ | 51.5 | 12 | 16.51 | 51.84 |
| 6.5 | M½ | 52.8 | 13 | 16.92 | 53.16 |
| 7 | N½ | 54 | 14 | 17.35 | 54.51 |
| 7.5 | O½ | 55.3 | 15 | 17.75 | 55.76 |
| 8 | P½ | 56.6 | 16 | 18.19 | 57.15 |
| 8.5 | Q½ | 57.8 | 17 | 18.53 | 58.21 |
| 9 | R½ | 59.2 | 18 | 18.89 | 59.34 |
| 9.5 | S | 60.4 | 19 | 19.41 | 60.98 |
| 10 | T | 61.6 | 20 | 19.84 | 62.33 |
| 10.5 | U | 63 | 21 | 20.20 | 63.46 |
| 11 | V | 64.1 | 22 | 20.68 | 64.97 |
| 11.5 | W | 65.3 | 23 | 21.08 | 66.22 |
| 12 | X | 66.6 | 24 | 21.49 | 67.51 |
| 12.5 | Y | 67.8 | 25 | 21.89 | 68.77 |
| 13 | Z | 69.1 | 26 | 22.33 | 70.15 |
Note: Ring sizes may vary slightly between manufacturers. We recommend measuring your finger at room temperature for the most accurate result.
Step-by-Step Guide
How to Measure Your Ring Size
1 String or Paper Strip Method
Cut a thin strip of paper or take a piece of non-stretchy string approximately 10 cm (4 inches) long.
Wrap the strip snugly around the base of your finger, just below the knuckle. It should be comfortable - not too tight, not too loose.
Mark the point where the strip overlaps with a pen. Lay the strip flat and measure the length in millimetres from the end to the mark.
Divide the measurement by 3.14159 (pi) to get the inner diameter in millimetres. Use the converter above to find your size.
2 Existing Ring Method
Select a ring that fits comfortably on the finger you want to measure. Make sure it is a ring that fits well - not too loose or tight.
Place the ring on a flat surface. Using a ruler with millimetre markings, measure the inside diameter of the ring from edge to edge.
Be sure to measure the widest inner point of the ring for the most accurate reading.
Enter the diameter in the converter above, or match it to the chart to find your ring size in any standard.
Pro Tips for Accurate Measurement
- Measure at the end of the day when fingers are at their largest.
- Avoid measuring when your hands are cold, as fingers shrink in cold weather.
- Measure multiple times for consistency and take the average.
- If between sizes, choose the larger size for comfort.
- Wide bands (over 6mm) typically need a half size larger than narrow bands.
- Your dominant hand is usually slightly larger than the other.
Print & Measure
Printable Ring Sizer
Print this page to get a physical ring sizer. Place your existing ring over the circles to find the matching size. Make sure your printer is set to 100% scale (no scaling) for accurate results.
Important: Set printer to "Actual Size" or 100% scale. Do not use "Fit to Page".
US 5
15.7 mm
US 6
16.51 mm
US 7
17.35 mm
US 8
18.19 mm
US 9
18.89 mm
US 10
19.84 mm
Preview only. Print for accurate sizing.
Found Your Size?
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Now that you know your size, explore our curated collection of fine rings crafted with 14K solid gold, diamonds, sapphires, and precious gemstones.