Find Your Ring Size (No Ring Needed)
Use a piece of string or a thin strip of paper to measure your finger. Then match your measurement (in mm) to the table below.
Method 1: String or Paper (recommended)
- Wrap string/paper around the finger you want to wear the ring on.
- Make it snug, but not tight (comfortable like a ring would sit).
- Mark where the ends meet.
- Lay it flat on a ruler and measure the length in mm.
- That number is your finger circumference.
Quick checks (avoid wrong sizes)
- Measure at the end of the day (fingers swell slightly).
- If you’re between sizes, choose the larger size.
- If your knuckle is bigger, measure both and choose the size that fits over the knuckle.
- Don’t measure when your hands are very cold.
What number do I use?
Use Finger Circumference (mm) from your string/paper measurement, then pick the matching JC size below.
Use Finger Circumference (mm) from your string/paper measurement, then pick the matching JC size below.
| JC Ring Size | Finger Circumference (mm) | Inner Diameter (mm) | UK Size | EU Size |
|---|---|---|---|---|
| SZ 8 | 57.18 | 18.2 | P | 57 |
| SZ 9 | 59.69 | 19.0 | R | 60 |
| SZ 10 | 62.52 | 19.9 | T½ | 63 |
| SZ 11 | 66.03 | 20.7 | V½ | 65 |
| SZ 12 | 67.54 | 21.5 | W½ / X | 68 |
| SZ 13 | 70.06 | 22.3 | Z | 70 |
SZ 857.18 mm
Finger Circumference
SZ 959.69 mm
Finger Circumference
SZ 1062.52 mm
Finger Circumference
SZ 1166.03 mm
Finger Circumference
SZ 1267.54 mm
Finger Circumference
SZ 1370.06 mm
Finger Circumference
Note: Measurements can vary slightly depending on temperature and how snug you measure. If you’re unsure, measure twice and choose the more comfortable option.