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Online Ring Size
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Contact Us

We’re a small team and we read every message. Whether you’ve found a bug, have a feature request, or just want to say hello — reach out using the form below.

We read every message. Your address is used to reply and nothing else — see the privacy policy.

Faster than waiting for a reply

Most of what reaches us is already answered somewhere on the site. These three cover the majority of it.

FAQ

Accuracy, conversions, and what to do when you fall between two sizes.

How accurate is it?

The full derivation of the range we print on every result.

Ring size chart

Every national standard side by side, with millimetres.

Found an error in a size chart?

Please send it. Every size on this site is computed from a published standard rather than copied from a table, so a genuine error is a bug in a formula and we want to know. Tell us the country, the size you expected, and the size we showed.