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Create a QR code for a link, Wi-Fi, WhatsApp, contact and more, or read one from a photo.
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Ring size converter
US, UK and EU ring sizes, and your size from a ring's diameter or your finger's circumference.
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- Works on any device
About Ring size converter
Convert ring sizes between US, UK and EU, or find your size from the inner diameter of a ring or the circumference of your finger. EU sizes equal the inner circumference in millimetres, so a size 54 ring has a 54 mm circumference. Measure at the end of the day, when fingers are largest.
How to use Ring size converter
- Choose US, UK or EU sizing, or enter a diameter or circumference.
- Pick or type your size.
- Read the matching sizes in other systems.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
How do I measure my ring size at home?
Wrap string or paper around the base of the finger, mark the overlap and measure its length in mm. That is your circumference.
What is the difference between diameter and circumference?
Diameter is the width across the inside of the ring, while circumference is the length around your finger. Use whichever you measured, and the tool converts to a ring size.
When is the best time to measure my finger?
Fingers swell with heat and shrink in the cold, so measure at the end of the day when the finger is at a normal temperature. Measure two or three times.
Is Ring size converter free?
Yes. Ring size converter on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Ring size converter on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.