what size are thumb rings typically
Â· just now. 1  The average ring size of a man's thumb is around 12. tutaliza Â· 8 years ago. 2  9. Ashkat Â· 8 years ago. 0. 3  Mens Thumb Rings Uk. Source(s): https://shrinke.im/a02pB. 4  i love rings and i have plenty too. i would say that he should be around a size 10 to 11. You can always resize it for free too.