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Ring size 13 in mm and international sizes
A US/Canadian size 13 ring is 22.2 mm across the inside and 69.7 mm around. Larger sizes are stocked less often; check that a design is offered this large before falling for it.
- US / Canada
- 13
- UK / Australia
- Z+1
- EU / ISO
- 70
- Japan / China
- 27
- India
- 30
- Italy / Spain / CH
- 30
- Inside diameter
- 22.2 mm
- Circumference
- 69.7 mm
- Diameter (in)
- 0.874″
Size 13 and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 12½ | Z | 68 | 26 | 21.79 mm | 68.5 mm |
| 12¾ | Z | 69 | 27 | 21.99 mm | 69.1 mm |
| 13 | Z+1 | 70 | 27 | 22.20 mm | 69.7 mm |
| 13¼ | Z+1 | 70 | 27 | 22.40 mm | 70.4 mm |
| 13½ | Z+2 | 71 | 27 | 22.60 mm | 71.0 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 68–71 mm for a size 13. If you're buying a band 6 mm or wider, consider half a size up instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 13 in mm?
A US size 13 ring has an inside diameter of 22.2 mm (0.874 in) and an inside circumference of 69.7 mm.
What is a US 13 in UK and European sizes?
US 13 is UK/Australian Z+1 and EU (ISO) 70. In Italy, Spain and Switzerland it is 30.
What is a US 13 in Japanese sizes?
The nearest Japanese and Chinese size is 27.
How do I know if I'm a size 13?
Wrap a paper strip around your finger: if it measures about 70 mm, you're a 13. Or measure a ring that fits: about 22.2 mm across the inside.