Home / Ring size chart / Size 6½
Ring size 6½ in mm and international sizes
A US/Canadian size 6½ ring is 16.9 mm across the inside and 53.1 mm around. This sits in the most commonly sold range for women's rings, according to jeweler sizing guides.
- US / Canada
- 6½
- UK / Australia
- M½
- EU / ISO
- 53
- Japan / China
- 13
- India
- 13
- Italy / Spain / CH
- 13
- Inside diameter
- 16.9 mm
- Circumference
- 53.1 mm
- Diameter (in)
- 0.666″
Size 6½ and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 6 | L½ | 52 | 11 | 16.51 mm | 51.9 mm |
| 6¼ | M | 52 | 12 | 16.71 mm | 52.5 mm |
| 6½ | M½ | 53 | 13 | 16.91 mm | 53.1 mm |
| 6¾ | N | 54 | 13 | 17.12 mm | 53.8 mm |
| 7 | N½ | 54 | 14 | 17.32 mm | 54.4 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 52–54 mm for a size 6½. If you're buying a band 6 mm or wider, consider size 7 instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 6½ in mm?
A US size 6½ ring has an inside diameter of 16.9 mm (0.666 in) and an inside circumference of 53.1 mm.
What is a US 6½ in UK and European sizes?
US 6½ is UK/Australian M½ and EU (ISO) 53. In Italy, Spain and Switzerland it is 13.
What is a US 6½ in Japanese sizes?
The nearest Japanese and Chinese size is 13.
How do I know if I'm a size 6½?
Wrap a paper strip around your finger: if it measures about 53 mm, you're a 6½. Or measure a ring that fits: about 16.9 mm across the inside.