Home / Ring size chart / Size 11½
Ring size 11½ in mm and international sizes
A US/Canadian size 11½ ring is 21.0 mm across the inside and 65.9 mm around. Larger sizes are stocked less often; check that a design is offered this large before falling for it.
- US / Canada
- 11½
- UK / Australia
- W½
- EU / ISO
- 66
- Japan / China
- 24
- India
- 26
- Italy / Spain / CH
- 26
- Inside diameter
- 21.0 mm
- Circumference
- 65.9 mm
- Diameter (in)
- 0.826″
Size 11½ and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 11 | V½ | 65 | 23 | 20.57 mm | 64.6 mm |
| 11¼ | W | 65 | 24 | 20.77 mm | 65.3 mm |
| 11½ | W½ | 66 | 24 | 20.98 mm | 65.9 mm |
| 11¾ | X | 67 | 24 | 21.18 mm | 66.5 mm |
| 12 | X½ | 67 | 25 | 21.38 mm | 67.2 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 65–67 mm for a size 11½. If you're buying a band 6 mm or wider, consider size 12 instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 11½ in mm?
A US size 11½ ring has an inside diameter of 21.0 mm (0.826 in) and an inside circumference of 65.9 mm.
What is a US 11½ in UK and European sizes?
US 11½ is UK/Australian W½ and EU (ISO) 66. In Italy, Spain and Switzerland it is 26.
What is a US 11½ in Japanese sizes?
The nearest Japanese and Chinese size is 24.
How do I know if I'm a size 11½?
Wrap a paper strip around your finger: if it measures about 66 mm, you're a 11½. Or measure a ring that fits: about 21.0 mm across the inside.