US Ring Size 9 in mm (Diameter & Circumference)
US ring size 9 = 18.95 mm inner diameter, 59.5 mm circumference (UK R½, EU 59.5, JP 18)
| US/CA | UK/AU | EU/ISO | JP | Diameter | Circumference |
|---|---|---|---|---|---|
| 8 | P½ | 57 | 16 | 18.13 mm | 57 mm |
| 8.5 | Q½ | 58 | 17 | 18.54 mm | 58.2 mm |
| 9 | R½ | 59.5 | 18 | 18.95 mm | 59.5 mm |
| 9.5 | S½ | 61 | 19 | 19.35 mm | 60.8 mm |
| 10 | T½ | 62 | 20 | 19.76 mm | 62.1 mm |
FAQ
What is ring size 9 in mm?
About 18.95 mm across the inside, 59.5 mm around.
What is US 9 in UK size?
About R½.
Related
Sizes vary by brand and seller. Always check the product's own size chart and measure yourself; this chart is a general standard guide.