US Ring Size 4.5 in mm (Diameter & Circumference)
US ring size 4.5 = 15.29 mm inner diameter, 48 mm circumference (UK I½, EU 48, JP 8)
| US/CA | UK/AU | EU/ISO | JP | Diameter | Circumference |
|---|---|---|---|---|---|
| 3.5 | — | 45.5 | — | 14.47 mm | 45.5 mm |
| 4 | H½ | 46.5 | 7 | 14.88 mm | 46.7 mm |
| 4.5 | I½ | 48 | 8 | 15.29 mm | 48 mm |
| 5 | J½ | 49.5 | 9 | 15.69 mm | 49.3 mm |
| 5.5 | K½ | 50.5 | 10 | 16.1 mm | 50.6 mm |
FAQ
What is ring size 4.5 in mm?
About 15.29 mm across the inside, 48 mm around.
What is US 4.5 in UK size?
About I½.
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.