How to Measure Your Ring Size
How to Measure Your Ring Size
If the ring you receive doesn’t fit, resizing is available — see our Ring Resize Service.
Method 1 — Use a ring you already own (Most accurate)
1. If you already know the size of a ring that fits you comfortably, just tell us that size.
If you don’t know the size of your ring, follow Method 2 to measure its inner diameter.
Method 2 — Measure the inner diameter of your ring (Second accurate)
- Place the ring on a ruler and read the inner diameter across the center line (mm).
- Match the number with the table below to find your US size.

Diameter (mm) | US Size |
---|---|
14.05 | 3 |
14.45 | 3½ |
14.85 | 4 |
15.27 | 4½ |
15.70 | 5 |
16.10 | 5½ |
16.51 | 6 |
16.92 | 6½ |
17.35 | 7 |
17.75 | 7½ |
18.19 | 8 |
18.53 | 8½ |
18.89 | 9 |
19.41 | 9½ |
19.84 | 10 |
20.20 | 10½ |
20.69 | 11 |
21.09 | 11½ |
21.49 | 12 |
21.89 | 12½ |
22.33 | 13 |
Method 3 — Measure your finger circumference (Less accurate)
- Cut a paper strip no wider than 5 mm.
- Wrap it around the base of your finger, mark the overlap, then lay it flat and measure the length (mm).
- As per our guide: subtract 2 mm from the measured length to account for paper thickness, then match the value with the table below.

Important notes for the wrapped-paper method:
- Using paper wider than 5 mm → readings tend to be larger than the true size.
- Using a wide sewing tape → can introduce measurement errors.
- Using string → elasticity (stretch/shrink) from pulling can cause inaccuracies.
Circumference (mm) | US Size |
---|---|
43.4 | 3 |
44.9 | 3½ |
46.5 | 4 |
47.8 | 4½ |
49.0 | 5 |
50.3 | 5½ |
51.5 | 6 |
52.8 | 6½ |
54.0 | 7 |
55.3 | 7½ |
56.6 | 8 |
57.8 | 8½ |
59.1 | 9 |
60.5 | 9½ |
62.2 | 10 |
63.1 | 10½ |
64.3 | 11 |
65.7 | 11½ |
67.9 | 12 |
68.5 | 12½ |
70.1 | 13 |