Finding your perfect ring size is easy. Use one of the methods below to determine your size before ordering.
Method 1: Measure an Existing Ring
If you already own a ring that fits the intended finger, measure the inside diameter in millimeters and match it to the chart below.
Method 2: String or Paper Strip
- Cut a thin strip of paper or a piece of non-stretchy string.
- Wrap it snugly around the base of the finger you want to measure.
- Mark where the strip overlaps.
- Lay the strip flat and measure the length in millimeters.
- Find your circumference in the chart below to determine your size.
US Ring Size Chart
| US Size |
Inside Diameter (mm) |
Circumference (mm) |
| 3 | 14.0 | 44.0 |
| 3.5 | 14.4 | 45.2 |
| 4 | 14.8 | 46.5 |
| 4.5 | 15.2 | 47.8 |
| 5 | 15.7 | 49.0 |
| 5.5 | 16.1 | 50.3 |
| 6 | 16.5 | 51.5 |
| 6.5 | 16.9 | 52.8 |
| 7 | 17.3 | 54.0 |
| 7.5 | 17.7 | 55.3 |
| 8 | 18.1 | 56.6 |
| 8.5 | 18.5 | 57.8 |
| 9 | 18.9 | 59.1 |
| 9.5 | 19.4 | 60.3 |
| 10 | 19.8 | 61.6 |
| 10.5 | 20.2 | 62.8 |
| 11 | 20.6 | 64.1 |
| 11.5 | 21.0 | 65.3 |
| 12 | 21.4 | 66.6 |
| 12.5 | 21.8 | 67.9 |
| 13 | 22.2 | 69.1 |
Tips for an Accurate Measurement
- Measure your finger at the end of the day when fingers are at their largest.
- Avoid measuring when your hands are cold — cold fingers are smaller.
- If the ring will sit above a knuckle, measure both the knuckle and the base of the finger and choose a size in between.
- Wider bands (6 mm+) typically need a half-size larger for a comfortable fit.
- If you are between sizes, order the larger size — it is easier to size a ring down than up.
Still Not Sure?
Contact us at 1-877-872-9909 or email us and we will help you find the perfect fit. All USA Jewels rings include free returns if the size is not right.