Ring Size Chart
Use our comprehensive international chart to instantly convert your finger's millimeter circumference into standard US, UK, European, Japanese, and Indian ring sizes.
| Circumference (mm) | US / Canada | UK / Australia | Europe | Japan | India |
|---|---|---|---|---|---|
| 44.2 | 3 | F | 44 | 4 | 4 |
| 45.5 | 3.5 | G | 45 | 5 | 6 |
| 46.8 | 4 | H 1/2 | 47 | 7 | 7 |
| 48.0 | 4.5 | I 1/2 | 48 | 8 | 8 |
| 49.3 | 5 | J 1/2 | 49 | 9 | 9 |
| 50.6 | 5.5 | K 1/2 | 50 | 10 | 10 |
| 51.9 | 6 | M | 52 | 11 | 12 |
| 53.1 | 6.5 | N | 53 | 13 | 13 |
| 54.4 | 7 | O | 54 | 14 | 14 |
| 55.7 | 7.5 | P | 56 | 15 | 15 |
| 57.0 | 8 | Q | 57 | 16 | 17 |
| 58.3 | 8.5 | Q 1/2 | 58 | 17 | 18 |
| 59.5 | 9 | R 1/2 | 60 | 18 | 19 |
| 60.8 | 9.5 | S 1/2 | 61 | 19 | 21 |
| 62.1 | 10 | T 1/2 | 62 | 20 | 22 |
| 63.4 | 10.5 | U 1/2 | 63 | 22 | 23 |
| 64.6 | 11 | V 1/2 | 65 | 23 | 25 |
| 65.9 | 11.5 | W 1/2 | 66 | 24 | 26 |
| 67.2 | 12 | Y | 67 | 25 | 27 |
Need to find your exact ring size?
Skip printable paper charts and printer scaling errors. Calibrate your screen and measure your ring size instantly with our interactive sizer.
How to Read the Ring Size Chart
This international ring size chart converts the inner circumference of your finger (or the inner circumference of an existing ring) into localized size standard formats.
Fingers are measured in millimeters. The most mathematically direct standard is the European system, which simply states the circumference in millimeters (e.g., a 54mm circumference is a European size 54). Other countries use scales: the US uses numeric integers and fractions, the UK uses letters, and India and Japan use numerical scales from 1 to 30.
Tips for Sizing Accuracy
- Temperature Matters: Fingers expand in warm environments and contract in the cold. Never measure cold fingers. For accuracy, measure at the end of the day when hands are warm.
- Knuckle Clearance: A ring must fit over the joint. If your knuckle is significantly larger than the finger base, measure both. Select a size in the middle of the two measurements.
- Band Width Adjustment: Wider bands (6mm or more) fit tighter. Consider sizing up by a half size if purchasing a thick wedding band.
Understanding Printable Sizers & Scaling Errors
Many online buyers resort to printing a PDF sizer chart. However, this is one of the most common causes of incorrect ring sizes.
Critical Warning on Printable Templates
Standard office and home printers default to setting scales like "Fit to Page" or "Shrink to Page Width." Because 1 millimeter of error shifts your size by a full number, printable guides are frequently inaccurate.
How to Safely Use a Printable Chart
If you choose to use a printable sizer, you must verify the scaling before measuring:
- Ensure your printer settings are set to "Actual Size" or 100% Scaling (disable margins adjustments).
- Print the page and locate the physical verification line (often a 2-inch or 5-centimeter line printed on the template).
- Use a physical ruler to measure the line. If it is not exactly 2 inches or 5 centimeters, discard the printout and adjust your printer parameters.
- Alternative: Skip the paper and printer entirely. Use our screen-calibrated, interactive sizer on the homepage.