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Ring size 5 in mm and international sizes
A US/Canadian size 5 ring is 15.7 mm across the inside and 49.3 mm around. This is on the smaller side of adult sizes and common for little fingers, slim fingers and midi rings.
- US / Canada
- 5
- UK / Australia
- J½
- EU / ISO
- 49
- Japan / China
- 9
- India
- 9
- Italy / Spain / CH
- 9
- Inside diameter
- 15.7 mm
- Circumference
- 49.3 mm
- Diameter (in)
- 0.618″
Size 5 and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 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 |
| 5¼ | K | 50 | 10 | 15.90 mm | 49.9 mm |
| 5½ | K½ | 51 | 10 | 16.10 mm | 50.6 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 48–51 mm for a size 5. If you're buying a band 6 mm or wider, consider size 5½ instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 5 in mm?
A US size 5 ring has an inside diameter of 15.7 mm (0.618 in) and an inside circumference of 49.3 mm.
What is a US 5 in UK and European sizes?
US 5 is UK/Australian J½ and EU (ISO) 49. In Italy, Spain and Switzerland it is 9.
What is a US 5 in Japanese sizes?
The nearest Japanese and Chinese size is 9.
How do I know if I'm a size 5?
Wrap a paper strip around your finger: if it measures about 49 mm, you're a 5. Or measure a ring that fits: about 15.7 mm across the inside.