Ring Size Converter — free online tool
You found a ring you love online, but the size is in a system you've never heard of. Is a US 7 the same as a UK N? What does "17.3 mm" even mean? It's easy to order the wrong size when every country labels rings differently. We added a free tool that sorts it out for you — Ring Size Converter — right in your browser.
What it does
Type a ring size in any system you know — US, UK/AU, EU, or the inner diameter or circumference in millimeters — and you instantly see all the matching sizes side by side. There's also a full reference table, so you can scan the whole range and find the right size at a glance.
Nothing leaves your device
Everything runs right in your browser. The size you enter isn't uploaded anywhere and nothing is saved. When you close the page, it's gone. No account, no sign-up, just the answer.
How to use it
- Open Ring Size Converter.
- Enter a ring size in whichever system you have, or its diameter in mm.
- Read off the matching size for the system you need, or check the full table.
It's free with no limit. There are more small tools on the Apps page.