US Ring Size Chart (2026): Convert mm to US Sizes — Free Printable PDF
⚡ Quick Answer: US Ring Size System
US ring sizes are numbers from 1 to 15 in half-size increments. Average women’s: size 6 to 6.5 (inner diameter 16.5–16.9mm). Average men’s: size 9 to 10 (19.0–19.8mm). Each half size = approx. 1.6mm difference in circumference. US sizes are used identically in Canada. Always convert via mm for accuracy.
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1. How the US Ring Size System Works
- US sizes span from 1 (very small) through 15 (very large) in half-size increments.
- Each half-size step = approximately 1.6mm difference in circumference (0.5mm in diameter).
- US and Canadian ring sizes are identical — US size 6 = Canadian size 6.
- US sizes do NOT directly correspond to UK letter sizes or EU number sizes.
- Always convert using inner diameter or circumference in mm for accuracy.
2. Complete US Ring Size Chart
| Inner Diameter (mm) | Circumference (mm) | US Size | UK Size | EU Size | Japanese Size | Common Use |
|---|---|---|---|---|---|---|
| 14.0 | 44.0 | 3 | F | 44 | 4 | |
| 14.4 | 45.1 | 3.5 | G | 45 | 5 | |
| 14.8 | 46.5 | 4 | H | 46 | 6 | |
| 15.3 | 48.0 | 4.5 | I | 48 | 7 | |
| 15.7 | 49.3 | 5 | J | 49 | 9 | |
| 16.1 | 50.6 | 5.5 | K | 51 | 10 | |
| 16.5 | 52.0 | 6 | L–M | 52 | 12 | Avg women’s ★★ |
| 16.9 | 53.1 | 6.5 | M–N | 53 | 13 | Avg women’s ★★ |
| 17.3 | 54.5 | 7 | N | 54 | 14 | |
| 17.8 | 55.8 | 7.5 | O | 56 | 15 | |
| 18.2 | 57.0 | 8 | P | 57 | 16 | |
| 18.6 | 58.3 | 8.5 | Q | 58 | 17 | |
| 19.0 | 59.7 | 9 | R | 60 | 18 | Avg men’s ★★ |
| 19.4 | 61.0 | 9.5 | S | 61 | 19 | Avg men’s ★★ |
| 19.8 | 62.3 | 10 | T | 62 | 20 | Avg men’s ★★ |
| 20.2 | 63.5 | 10.5 | U | 63 | 21 | |
| 20.7 | 65.1 | 11 | V | 65 | 22 | |
| 21.5 | 67.5 | 12 | X | 67 | 24 | |
| 22.3 | 70.1 | 13 | Z | 70 | 26 | |
| 23.1 | 72.6 | 14 | Z+2 | 73 | 28 | |
| 24.0 | 75.4 | 15 | Z+4 | 75 | 30 |
3. How to Measure for Your US Ring Size
- Cut a thin paper strip (1cm wide, 15cm long).
- Wrap snugly around the base of the target finger in the evening.
- Mark the overlap, lay flat, measure in mm with a ruler.
- Find your mm reading in the Circumference column above.
- Read your US size. If between sizes, choose the larger.
4. US to UK / EU / Japanese Quick Reference
| US Size | UK Size | EU Size | Japanese | Inner Diameter (mm) |
|---|---|---|---|---|
| 5 | J | 49 | 9 | 15.7 |
| 6 | L–M | 52 | 12 | 16.5 |
| 6.5 | M–N | 53 | 13 | 16.9 |
| 7 | N | 54 | 14 | 17.3 |
| 8 | P | 57 | 16 | 18.2 |
| 9 | R | 60 | 18 | 19.0 |
| 10 | T | 62 | 20 | 19.8 |
| 12 | X | 67 | 24 | 21.5 |
5. Frequently Asked Questions
What is the smallest and largest standard US ring size?
Smallest commonly stocked: US 3 (inner diameter 14.0mm). Largest commonly stocked: 13–14. Sizes 15+ are speciality sizes available through custom or extended-range retailers.
Are US ring sizes the same as Canadian?
Yes. Canada uses the same numerical system. US size 6 = Canadian size 6. Canadian jewellers may also reference UK letter sizes — always confirm which system the retailer uses.
How do I convert a UK ring size to US?
Use inner diameter in mm as your reference. Find the UK letter in the chart, note the inner diameter, find that value in the US column. Example: UK size N = 17.3mm = US size 7.
Is US size 7 the same everywhere?
US size 7 is standardised to approx. 17.3mm inner diameter (54.5mm circumference) across all major US retailers. Minor variations of ±0.1mm exist between manufacturers. For precision sizing, always use mm measurements as your reference.
Tools & Downloads
Ring Size Calculator · US Chart PDF · UK Chart PDF · Full Conversion Chart · Measure at Home · How to Read a Ring Sizer
Ring Size Calculator · US Chart PDF · UK Chart PDF · Full Conversion Chart · Measure at Home · How to Read a Ring Sizer
FREE DOWNLOAD
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