Disclaimer

FingerSize offers free ring size charts, a size converter and a printable ring sizer. Everything here is general information, for guidance only.

Nothing on this site is professional advice from a jeweller or anyone else, and using it does not create any advisory relationship.

The sizes follow the written definition of each system: UK sizes BS 6820, EU sizes ISO 8653, US and Japanese sizes the published formulas, cross-checked against independent sources on 2026-10-23. The Indian, Chinese/Hong Kong and Brazilian charts are trade charts with no official standard, and they are labelled as such. Jewellers and brands cut their sizes differently, sometimes by half a size. The printed sizer and the on-screen measure are only as accurate as your printer and your screen calibration. We try to keep every figure right, but we cannot guarantee that it is complete, current or right for your ring.

Before you order, especially a ring that is engraved, set with stones or costly to resize, check the size with a jeweller or try a ring on. Before you use the printed sizer, measure the 50 mm line with a real ruler and check that a bank card fits the outline exactly.

To the extent permitted by law, the operator of this site accepts no liability for any direct or indirect loss or damage arising from the use of the site or of its results, including a ring that does not fit.

This site is independent. It is not run or endorsed by BSI, ISO or any jeweller, brand or organisation it mentions; their names are used only to cite sources.

The converter, the screen measure and the PDF all run in your browser. Nothing you enter is sent to us or stored on a server; only the screen calibration is saved, in your own browser.

If a size looks wrong, write to [email protected]. We check it against the standard, correct it and note the date of the change.

Last updated: 23 October 2026.