Home / Ring size chart / Size 4½
Ring size 4½ in mm and international sizes
A US/Canadian size 4½ ring is 15.3 mm across the inside and 48.0 mm around. This is on the smaller side of adult sizes and common for little fingers, slim fingers and midi rings.
- US / Canada
- 4½
- UK / Australia
- I½
- EU / ISO
- 48
- Japan / China
- 8
- India
- 8
- Italy / Spain / CH
- 8
- Inside diameter
- 15.3 mm
- Circumference
- 48.0 mm
- Diameter (in)
- 0.602″
Size 4½ and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 4 | H½ | 47 | 7 | 14.88 mm | 46.8 mm |
| 4¼ | I | 47 | 8 | 15.08 mm | 47.4 mm |
| 4½ | I½ | 48 | 8 | 15.29 mm | 48.0 mm |
| 4¾ | J | 49 | 8 | 15.49 mm | 48.7 mm |
| 5 | J½ | 49 | 9 | 15.69 mm | 49.3 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 47–49 mm for a size 4½. If you're buying a band 6 mm or wider, consider size 5 instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 4½ in mm?
A US size 4½ ring has an inside diameter of 15.3 mm (0.602 in) and an inside circumference of 48.0 mm.
What is a US 4½ in UK and European sizes?
US 4½ is UK/Australian I½ and EU (ISO) 48. In Italy, Spain and Switzerland it is 8.
What is a US 4½ in Japanese sizes?
The nearest Japanese and Chinese size is 8.
How do I know if I'm a size 4½?
Wrap a paper strip around your finger: if it measures about 48 mm, you're a 4½. Or measure a ring that fits: about 15.3 mm across the inside.