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Interactive Ring Size Converter
ConverterStandardize ring sizes across regions and diameters.
ttb run ring-size
US / Canada
7
UK / Australia
O
Europe (EU)
54.5
Japan / China
14
Inside Diameter
17.3 mm
Inside Circumference
54.4 mm
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How to Use Ring Size Converter
Measure the inner diameter or circumference of an existing ring, or wrap a strip of paper around your finger. Enter the measurement in millimeters. The tool converts to US, UK, EU, and Japanese ring size standards. Includes a printable ring sizer guide for accurate home measurement.
1
Enter your parameters
Configure the inputs for the Ring Size according to your specific needs.
2
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
3
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.
Frequently Asked Questions
What is the most common ring size?+
For women's engagement rings, sizes 5-7 (US) are most common, with size 6 being the average. For men's rings, sizes 8-12 are typical, with size 10 being the average. Finger size can vary with temperature, time of day, and diet.
How do I measure secretly for an engagement ring?+
Borrow a ring they wear on the correct finger, trace the inside on paper, or press it into soap to capture the impression. You can also compare their ring against a US ring size chart. When in doubt, size up — rings are easier to make smaller.