Ring Sizing
Without a jeweler's tools you can still find your ring size at home, with a piece of string or floss and a ruler.
How to measure
- Wrap string or floss around the base of the finger you'll wear the ring on. Mark where the ends overlap.
- Wrap it again over your knuckle and mark that too, since the ring has to slide over the knuckle.
- Lay the string flat and measure each mark in millimeters. Use the larger of the two.
- Find that circumference in the chart below to get your US ring size.
US ring sizes
| US size | Inside circumference | Inside diameter |
|---|---|---|
| 5 | 49.3 mm | 15.7 mm |
| 6 | 51.9 mm | 16.5 mm |
| 7 | 54.4 mm | 17.3 mm |
| 8 | 57.0 mm | 18.1 mm |
| 9 | 59.5 mm | 19.0 mm |
| 10 | 62.1 mm | 19.8 mm |
| 11 | 64.6 mm | 20.6 mm |
| 12 | 67.2 mm | 21.4 mm |
| 13 | 69.7 mm | 22.2 mm |
A few things that change the answer
- Every finger is different, and your dominant hand runs a little larger. Measure the exact finger you'll wear it on.
- Fingers swell in heat and shrink in cold. Measure when your hands are warm so the ring fits year-round.
- Measure a few times across different days; finger size drifts.
- Check both the base and the knuckle, so the ring clears the knuckle and still rests at the base.
Between sizes? Size up. A slightly loose ring is more comfortable, and it's easier to size a ring down than to stretch it larger. Some of our rings are resizable or adjustable, and the ring's own page tells you when.
Sizing a necklace instead? See our necklace length guide. Back to the full Peritik sizing guide.
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