Ring Size Converter
Convert ring sizes and find yours from a measurement.
Standard approximations — check the jeweler's chart before ordering.
Runs 100% in your browser. Your files are not uploaded to any server.
How to use Ring Size Converter
- Pick the size you know, or measure the inside diameter of a ring that fits.
- Read the matching size in every system.
- Tap any row to select it.
Frequently asked questions
How do I measure my finger?
Wrap a thin strip of paper around the base of the finger, mark where it overlaps and measure the length in millimeters — that's the circumference. Measure at the end of the day when fingers are largest.
What about Chinese ring sizes?
Chinese shops usually use Hong Kong sizes, which are close to Japanese sizes. Always confirm with the shop's own chart.
Is Ring Size Converter free?
Yes. Ring Size Converter is free to use with no sign-up and no watermark.
Are my files uploaded to your server?
No. All processing happens locally in your browser using JavaScript and WebAssembly. Your files never leave your device, which also makes it fast and private.
Does it work on my phone?
Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.