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Ring size 9 in mm and international sizes
A US/Canadian size 9 ring is 18.9 mm across the inside and 59.5 mm around. This range covers many men's rings and larger women's sizes.
- US / Canada
- 9
- UK / Australia
- R½
- EU / ISO
- 60
- Japan / China
- 18
- India
- 19
- Italy / Spain / CH
- 20
- Inside diameter
- 18.9 mm
- Circumference
- 59.5 mm
- Diameter (in)
- 0.746″
Size 9 and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 8½ | Q½ | 58 | 17 | 18.54 mm | 58.2 mm |
| 8¾ | R | 59 | 17 | 18.74 mm | 58.9 mm |
| 9 | R½ | 60 | 18 | 18.95 mm | 59.5 mm |
| 9¼ | S | 60 | 19 | 19.15 mm | 60.2 mm |
| 9½ | S½ | 61 | 19 | 19.35 mm | 60.8 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 58–61 mm for a size 9. If you're buying a band 6 mm or wider, consider size 9½ instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 9 in mm?
A US size 9 ring has an inside diameter of 18.9 mm (0.746 in) and an inside circumference of 59.5 mm.
What is a US 9 in UK and European sizes?
US 9 is UK/Australian R½ and EU (ISO) 60. In Italy, Spain and Switzerland it is 20.
What is a US 9 in Japanese sizes?
The nearest Japanese and Chinese size is 18.
How do I know if I'm a size 9?
Wrap a paper strip around your finger: if it measures about 60 mm, you're a 9. Or measure a ring that fits: about 18.9 mm across the inside.