Free Ring Size Converter & Finger Measurement Chart Online
Convert finger circumference and diameter in millimeters and inches into US, UK/Australia, European, and Japanese ring sizes. — 100% free online utility, zero sign-up, zero paywalls, and private client-side processing.
How It Works
Enter Finger Measurement
Input inside diameter or wrap circumference in mm.
Select Measurement Unit
Choose millimeters or inches.
View International Sizing
View matching US numeric sizes (e.g. 7), UK letter sizes (e.g. N), and EU mm scale.
Frequently Asked Questions
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