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Ring size 3 in mm and international sizes
A US/Canadian size 3 ring is 14.1 mm across the inside and 44.2 mm around. This is on the smaller side of adult sizes and common for little fingers, slim fingers and midi rings.
- US / Canada
- 3
- UK / Australia
- F½
- EU / ISO
- 44
- Japan / China
- 4
- India
- 4
- Italy / Spain / CH
- 4
- Inside diameter
- 14.1 mm
- Circumference
- 44.2 mm
- Diameter (in)
- 0.554″
Size 3 and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 2½ | E½ | 43 | 3 | 13.66 mm | 42.9 mm |
| 2¾ | F | 44 | 3 | 13.87 mm | 43.6 mm |
| 3 | F½ | 44 | 4 | 14.07 mm | 44.2 mm |
| 3¼ | G | 45 | 5 | 14.27 mm | 44.8 mm |
| 3½ | G½ | 45 | 5 | 14.47 mm | 45.5 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 43–45 mm for a size 3. If you're buying a band 6 mm or wider, consider size 3½ instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 3 in mm?
A US size 3 ring has an inside diameter of 14.1 mm (0.554 in) and an inside circumference of 44.2 mm.
What is a US 3 in UK and European sizes?
US 3 is UK/Australian F½ and EU (ISO) 44. In Italy, Spain and Switzerland it is 4.
What is a US 3 in Japanese sizes?
The nearest Japanese and Chinese size is 4.
How do I know if I'm a size 3?
Wrap a paper strip around your finger: if it measures about 44 mm, you're a 3. Or measure a ring that fits: about 14.1 mm across the inside.