Ring Size Guide
A thoughtful fit, measured with confidence.
01 / Measure with care
String or paper method
- Wrap a non-stretch string or narrow paper strip around the base of the intended finger.
- Keep it snug, not tight. Mark where the ends meet; do not add a comfort allowance yet.
- Lay the strip flat and measure from the start to your mark in millimeters. Repeat three times.
- Match the circumference to the conversion table. A paper or string measurement is an estimate, not a substitute for a jeweler’s fitting.
Measure an existing ring
Choose a round ring that fits the same finger and hand. Measure the inside diameter, not the outside edge, or place it over the true-scale circles in the PDF. Match the circle to the ring’s inner edge.
If the ring is oval, bent or between circles, have a jeweler measure it. Never measure the circles from a screen.
02 / Print at true scale
Download the PDF and print on US Letter or A4 at 100% / Actual size. Turn off Fit to page and Shrink oversized pages. Measure the 50 mm calibration line with a physical ruler before cutting the strip. If it is not exactly 50 mm, do not use the printed measurements. Print settings—not the screen—determine scale.
03 / International ring sizes
| US | UK | EU ≈ | JP ≈ | Diameter mm | Circumference mm |
|---|---|---|---|---|---|
| 4 | H | 47 | 7 | 14.9 | 46.8 |
| 4.5 | I | 48 | 8 | 15.3 | 48 |
| 5 | J½ | 49 | 9 | 15.7 | 49.3 |
| 5.5 | K½ | 51 | 10 | 16.1 | 50.6 |
| 6 | L½ | 52 | 11–12 | 16.5 | 51.9 |
| 6.5 | M½ | 53 | 13 | 16.9 | 53.1 |
| 7 | N½ | 54 | 14 | 17.3 | 54.4 |
| 7.5 | O½ | 56 | 14–15 | 17.7 | 55.7 |
| 8 | P½ | 57 | 16–17 | 18.1 | 57 |
| 8.5 | Q½ | 58 | 17–18 | 18.5 | 58.3 |
| 9 | R½ | 60 | 18–19 | 19 | 59.5 |
| 9.5 | S½ | 61 | 19–20 | 19.4 | 60.8 |
| 10 | T½ | 62 | 20–22 | 19.8 | 62.1 |
| 10.5 | U½ | 63 | 23 | 20.2 | 63.4 |
| 11 | V½ | 65 | 23–24 | 20.6 | 64.6 |
| 11.5 | W | 66 | 25–26 | 20.9 | 65.9 |
| 12 | X½ | 67 | 25–27 | 21.4 | 67.2 |
| 12.5 | Y | 68 | 28 | 21.7 | 68.5 |
| 13 | Z½ | 70 | 27–29 | 22.2 | 69.7 |
Conversions are approximate: EU is rounded inner circumference in millimeters; UK and JP equivalents vary between charts and manufacturers. Confirm the sizing standard with client care. Professional fitting is best for valuable or non-resizable rings.
04 / The finer details
Time it right
Measure at the end of the day with comfortably warm hands. Repeat on two or three days; avoid exercise, extreme heat or cold just before measuring.
Wide bands
Bands around 6 mm or wider can feel tighter. Consider half a US size up, but confirm the specific band with a jeweler.
Knuckles
Measure your finger base and knuckle. The ring should pass the knuckle with gentle resistance and sit comfortably at the base. A large difference calls for a professional fitting.
A surprise proposal
Borrow a ring worn on the intended finger and hand, or ask a trusted friend. A ring from another finger is not a reliable match. Confirm that the setting can be resized before purchase.
