How does the ring size converter work?

Enter measurement in one system (US, UK, EU, JP) and it converts to all international ring size standards.

What ring size systems are supported?

US/Canada, UK/Australia, Europe (circumference mm), Japan, China, and Switzerland.

Yes, this tool is 100% free to use online with no registration or payment required. No hidden charges.

Absolutely. All processing is done locally in your browser. No data is uploaded to any server or stored anywhere.

What browsers are supported?

Chrome, Firefox, Safari, and Edge are fully supported. The tool works on both desktop and mobile devices.

Are there usage limits?

No, you can use this tool as many times as you need. There are no daily limits or usage caps.

Does it work offline?

After the page loads, the tool works entirely in your browser. No internet connection is needed for processing.

Ring Size Converter - US UK EU JP Ring Size Chart

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Updated: 2026-07-11

Ring Size System

Enter Size

International Ring Size Chart

📏 Measurement Guide

Wrap a strip of paper or string around the base of your finger
Mark where the ends meet, then measure the length (circumference)
Find the corresponding size in the chart above
Measure at different times (finger size varies with temperature)
For engagement rings, choose slightly larger

About Ring Size Converter

Free online ring size converter. Convert between US, UK, EU, JP, FR, CN, and AU ring size standards. Enter a size value and instantly get equivalent sizes across all major systems. Built-in finger circumference measurement guide with detailed size charts. Perfect for online ring shopping, engagement rings, wedding bands, and international jewelry brands. Client-side only, no data upload.