Ring Size Guide
Finding the perfect ring size matters. Here’s how to measure at home so your ring fits beautifully from day one.
Method 1: Measure an Existing Ring
If you already own a ring that fits the correct finger, this is the easiest approach.
- Place a ring that fits well on a flat ruler or measuring tape.
- Measure the inside diameter from edge to edge in millimeters.
- Compare your measurement to the size chart below to find your US ring size.
Method 2: String or Paper Strip
No ring handy? A thin strip of paper or a piece of string works just as well.
- Cut a thin strip of paper or a piece of non-stretchy string.
- Wrap it snugly around the finger you plan to wear the ring on, just below the knuckle.
- Mark the point where the strip overlaps with a pen or marker.
- Lay the strip flat and measure the length in millimeters—this is the circumference.
- Find your size in the chart below using the circumference column.
Ring Size Chart
All measurements are approximate. When in doubt, round up to the nearest half size.
| US Size | Inside Diameter (mm) | Circumference (mm) |
|---|---|---|
| 3 | 14.0 | 44.2 |
| 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 |
Pro Tips
- Measure at the end of the day when fingers are naturally slightly larger.
- Avoid measuring when your hands are cold—fingers shrink in cooler temperatures.
- If you fall between two sizes, go up half a size for a more comfortable fit.
- Wider bands fit tighter—size up by half for bands over 6 mm wide.
- We offer free resizing within 30 days of purchase, so you’re never stuck.
Frequently Asked Questions
No worries at all. We offer free resizing within 30 days of delivery. Simply contact us and we’ll arrange the exchange—shipping is on us.
Borrow a ring they already wear on their ring finger and measure its inside diameter in millimeters. You can also trace the ring on paper and bring or send it to us for sizing help.
Yes. Wider bands (over 6 mm) sit tighter on the finger because they cover more surface area. We recommend sizing up by half a size for wider styles.
Not sure? Contact us at hello@peacefuldiamonds.com—we’re happy to help.
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