Guide
Ring Sizing Guide
Ring fit depends on the finger, band width, temperature, and measuring method. Use these methods for an estimate, then confirm the size before your ring enters production.
Complimentary
Request a complimentary ring sizer before production
How to Measure Your Ring Size
Method 1: Measure an Existing Ring
- 1
Find a ring that fits the correct finger comfortably
- 2
Place the ring on a ruler and measure the inside diameter in millimeters
- 3
Use the chart below as a reference, then confirm before production
Method 2: Paper Strip Method
- 1
Cut a thin strip of paper or use a piece of string
- 2
Wrap it snugly around the base of the finger
- 3
Mark where the strip overlaps, then measure the length in millimeters
- 4
Match the circumference to the chart below
Method 3: Visit a Local Jeweler
- 1
Ask a local jeweler to measure with professional ring gauges
- 2
Confirm any fee before the fitting
- 3
Ask them to measure the exact finger you'll wear the ring on
US Ring Size Chart
All measurements in millimeters
| US Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 3 | 14.1 | 44.2 |
| 3.5 | 14.5 | 45.5 |
| 4 | 14.9 | 46.8 |
| 4.5 | 15.3 | 48.0 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.9 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.4 |
| 7.5 | 17.7 | 55.7 |
| 8 | 18.1 | 56.9 |
| 8.5 | 18.5 | 58.2 |
| 9 | 18.9 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
| 11 | 20.6 | 64.6 |
| 12 | 21.4 | 67.2 |
| 13 | 22.2 | 69.7 |
Sizing Tips
Fingers swell slightly in heat and shrink in cold — measure at room temperature
Measure at the end of the day when fingers are at their largest
If you fall between sizes, confirm the fit rather than automatically rounding in one direction
Wider bands can feel tighter — test a gauge close to the finished band width
Dominant hand fingers are often slightly larger — measure the correct hand
We offer one complimentary resize within 1 year of delivery
Not Sure of Your Size?
Book a free consultation and we'll walk you through sizing options. Request a complimentary ring sizer if you want to confirm the fit before production.
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Editorial record
Review and sources
Written and reviewed by Sula Bridal. Last reviewed August 3, 2026. Product availability and grading-report details can vary by selected stone; confirm the exact specifications shown before purchase.