Utility
Ring Size Calculator
Enter your finger circumference in millimeters to instantly find your ring size.
Your result will glow up right here.
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Fit Confidence
Utility
Enter your finger circumference in millimeters to instantly find your ring size.
Your result will glow up right here.
Ring sizing can vary depending on the measurement system used, which can make shopping for rings — especially as a surprise gift — a bit tricky. This calculator converts your measurements into standard ring size formats used by most jewelers, helping you find the right fit with more confidence.
For the most accurate results, measuring an existing ring that fits well, or measuring your finger at the end of the day when it's slightly larger, tends to give more reliable readings.
Wrapping a strip of paper or string around your finger and measuring the circumference, or measuring the inner diameter of a ring that already fits, are both common at-home methods.
Yes, fingers can be slightly larger later in the day or in warmer temperatures, so it's often recommended to measure at those times for the most comfortable fit.
Wider bands often fit more snugly, so some jewelers recommend sizing up slightly for wide-band rings.