Home / Ring size chart / Size 7½
Ring size 7½ in mm and international sizes
A US/Canadian size 7½ ring is 17.7 mm across the inside and 55.7 mm around. This sits in the most commonly sold range for women's rings, according to jeweler sizing guides.
- US / Canada
- 7½
- UK / Australia
- O½
- EU / ISO
- 56
- Japan / China
- 15
- India
- 15
- Italy / Spain / CH
- 16
- Inside diameter
- 17.7 mm
- Circumference
- 55.7 mm
- Diameter (in)
- 0.698″
Size 7½ and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 7 | N½ | 54 | 14 | 17.32 mm | 54.4 mm |
| 7¼ | O | 55 | 14 | 17.52 mm | 55.0 mm |
| 7½ | O½ | 56 | 15 | 17.73 mm | 55.7 mm |
| 7¾ | P | 56 | 16 | 17.93 mm | 56.3 mm |
| 8 | P½ | 57 | 16 | 18.13 mm | 57.0 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 54–57 mm for a size 7½. If you're buying a band 6 mm or wider, consider size 8 instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 7½ in mm?
A US size 7½ ring has an inside diameter of 17.7 mm (0.698 in) and an inside circumference of 55.7 mm.
What is a US 7½ in UK and European sizes?
US 7½ is UK/Australian O½ and EU (ISO) 56. In Italy, Spain and Switzerland it is 16.
What is a US 7½ in Japanese sizes?
The nearest Japanese and Chinese size is 15.
How do I know if I'm a size 7½?
Wrap a paper strip around your finger: if it measures about 56 mm, you're a 7½. Or measure a ring that fits: about 17.7 mm across the inside.