Ring Size Guide
Follow these simple steps to measure your ring size accurately at home.
Millimeters (Most Accurate)
Wrap a measuring tape or paper around the base of your finger.
Mark the overlap and measure the length in millimeters.
Match it to the size chart below.
Centimeters
1 cm = 10 mm.
Measure the circumference in cm, then convert to mm to find your ring size.
Inches
Use a soft tape to measure the circumference in inches.
1 inch = 25.4 mm.
Convert to mm and check the size chart.
How to Measure Your Ring Size at Home
1. Cut a thin strip of paper or use soft measuring tape.
2. Wrap it snugly around the base of your finger.
3. Mark where the strip overlaps.
4. Measure the length in mm using a ruler.
5. Ensure the strip can slide over your knuckle.
6. Compare your measurement with the size chart below.
Tips for the Most Accurate Ring Size
• Measure your finger at the end of the day, when it is naturally slightly larger.
• Avoid measuring in cold temperatures, as fingers tend to shrink.
• If you are between sizes, select the larger size for comfort.
• Measure two to three times to ensure accuracy.
• Wider bands may fit more snugly — consider sizing up by ½.
• Ensure the ring slides comfortably over the knuckle, not just the base.
All measurements below refer to the inner diameter of the ring.
| Ring Size | Diameter (MM) | Diameter (CM) | Diameter (Inches) |
|---|---|---|---|
| 4 | 14.86 | 1.49 | 0.59 |
| 5 | 15.27 | 1.53 | 0.60 |
| 6 | 16.51 | 1.65 | 0.65 |
| 7 | 17.35 | 1.74 | 0.68 |
| 8 | 18.19 | 1.82 | 0.72 |
| 9 | 19.03 | 1.90 | 0.75 |
| 10 | 19.84 | 1.98 | 0.78 |
| 11 | 20.68 | 2.07 | 0.81 |
| 12 | 21.49 | 2.15 | 0.85 |
| 13 | 22.33 | 2.23 | 0.88 |
| 14 | 23.17 | 2.32 | 0.91 |
| 15 | 23.98 | 2.40 | 0.94 |
Still Unsure About Your Size?
We can help you choose the perfect fit.
Email us at support@celestardiamonds.com for personalized sizing assistance.