About FingerSize

FingerSize is a free ring size chart, converter and printable ring sizer. There is no account, no upload and no tracking of what you measure — the converter and the PDF both run inside your browser.

Ring sizing is one of the few everyday measurements where the published charts genuinely disagree with each other. Two well-known British jewellers print circumferences for the letter N that are more than a millimetre apart. We build every number on this site from the written definition of each system instead of copying someone else’s table, and we say on the page which systems have a published standard behind them and which do not.

The printable sizer is the part most sites get wrong. A browser will happily shrink a PDF to fit the paper, and a ring sizer that printed 4 % small sends you a ring a whole size too tight. Every sheet of our PDF carries a 50 mm ruler and a bank-card outline so you can check the scale with a real ruler before you cut anything out.