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Ring size 10 in mm and international sizes
A US/Canadian size 10 ring is 19.8 mm across the inside and 62.1 mm around. This range covers many men's rings and larger women's sizes.
- US / Canada
- 10
- UK / Australia
- T½
- EU / ISO
- 62
- Japan / China
- 20
- India
- 22
- Italy / Spain / CH
- 22
- Inside diameter
- 19.8 mm
- Circumference
- 62.1 mm
- Diameter (in)
- 0.778″
Size 10 and its neighbours
| US | UK | EU | Japan | Diameter | Circumference |
|---|---|---|---|---|---|
| 9½ | S½ | 61 | 19 | 19.35 mm | 60.8 mm |
| 9¾ | T | 61 | 19 | 19.55 mm | 61.4 mm |
| 10 | T½ | 62 | 20 | 19.76 mm | 62.1 mm |
| 10¼ | U | 63 | 21 | 19.96 mm | 62.7 mm |
| 10½ | U½ | 63 | 22 | 20.16 mm | 63.3 mm |
Check it's really your size
A strip of paper wrapped around your finger should measure 61–63 mm for a size 10. If you're buying a band 6 mm or wider, consider size 10½ instead. Not sure? Try the ring size calculator or the online sizer.
Questions people ask
What is ring size 10 in mm?
A US size 10 ring has an inside diameter of 19.8 mm (0.778 in) and an inside circumference of 62.1 mm.
What is a US 10 in UK and European sizes?
US 10 is UK/Australian T½ and EU (ISO) 62. In Italy, Spain and Switzerland it is 22.
What is a US 10 in Japanese sizes?
The nearest Japanese and Chinese size is 20.
How do I know if I'm a size 10?
Wrap a paper strip around your finger: if it measures about 62 mm, you're a 10. Or measure a ring that fits: about 19.8 mm across the inside.