Ring size guide
Find your ring size.
Measure at home in five minutes with a ring that already fits or a strip of paper. You’ll choose your size in the last step of the ring builder.
Two ways to measure
Measure at home
1
Use a ring that fits
- Pick a ring worn on the same finger.
- Measure straight across the inside, edge to edge, in millimetres.
- Find that number in the Inside diameter column below.
2
Measure your finger
- Wrap a strip of paper or string around the base of the finger.
- Mark where it overlaps, lay it flat and measure it in millimetres.
- Find that number in the Circumference column below.
Tips for a good fit
- Measure at the end of the day, when fingers are largest.
- Make sure the ring will slide over your knuckle.
- Between two sizes? Choose the larger one.
- Wide bands fit snugger — consider going up a quarter to half size.
| US size | Inside diameter | Circumference |
|---|---|---|
| 3 | 14.1 mm | 44.2 mm |
| 3.5 | 14.5 mm | 45.5 mm |
| 4 | 14.9 mm | 46.8 mm |
| 4.5 | 15.3 mm | 48.0 mm |
| 5 | 15.7 mm | 49.3 mm |
| 5.5 | 16.1 mm | 50.6 mm |
| 6 | 16.5 mm | 51.9 mm |
| 6.5 | 16.9 mm | 53.1 mm |
| 7 | 17.3 mm | 54.4 mm |
| 7.5 | 17.7 mm | 55.7 mm |
| 8 | 18.1 mm | 57.0 mm |
| 8.5 | 18.5 mm | 58.2 mm |
| 9 | 18.9 mm | 59.5 mm |
| 9.5 | 19.4 mm | 60.8 mm |
| 10 | 19.8 mm | 62.1 mm |
| 10.5 | 20.2 mm | 63.3 mm |
| 11 | 20.6 mm | 64.6 mm |
| 11.5 | 21.0 mm | 65.9 mm |
| 12 | 21.4 mm | 67.2 mm |
| 12.5 | 21.8 mm | 68.5 mm |
| 13 | 22.2 mm | 69.7 mm |
Size chart
US ring sizes
Sizes run in halves. If your measurement falls between two rows, choose the larger size.
Buying as a surprise? Borrow a ring they wear on the ring finger and measure it, or ask a close friend to find out.
Got your size? Grow your ring.
Pick a diamond, choose a setting, and add your size at the end.