About Ring Size Converter

A free, practical tool for converting ring sizes across international sizing systems — built for people who shop for jewelry online or need a quick printable sizer at home.

What this tool is

Ring Size Converter helps you convert between United States (US), United Kingdom (UK), European (EU), and Japanese (JP) ring sizes, as well as inner diameter in millimeters. The site also includes a printable ring sizer chart so you can measure at home without buying a physical gauge.

Everything runs in your browser as a static web page. There is no account system and no need to install an app. Enter a size, see the equivalents, and print the chart when you need it.

Why it exists

Jewelry retailers often list sizes in only one regional system. A US size 7 is not the same number as a European size, and UK sizes use letters. Mistakes are common when ordering gifts or shopping from another country. This converter exists to make those lookups fast, transparent, and free.

Who runs it

Ring Size Converter is operated by Ivica Lovrić, based in Croatia. The project is independently maintained as a free utility site. Advertising (when approved) helps cover hosting and ongoing maintenance so the tool can remain free to use.

What we do not do

• We do not sell rings or take jewelry orders.
• We do not replace professional jeweler sizing for high-value or custom pieces.
• We do not collect accounts or store your ring size in a personal profile.

Get in touch

Questions, corrections, or feedback are welcome on the Contact page. For how we handle data and advertising cookies, see the Privacy Policy. Use of the site is governed by the Terms of Use.