Find your ring size at home without a sizing kit by measuring the circumference of your finger. Wrap a thin strip of paper or a piece of string snugly around the base of the finger, mark where it overlaps, then measure that length with a ruler in millimeters. Enter the circumference here, or switch to diameter if you measured across an existing ring, and this tool returns your US, UK and European size using the standard ISO relationship between circumference, diameter and size. Measure at the end of the day when fingers are warmest and largest, and size up slightly if a knuckle is wider than the base. This is a guide rather than a guarantee, so confirm with a jeweler for expensive rings. The calculation runs entirely in your browser and updates as soon as you enter a measurement.
Find your ring size at home without a sizing kit by measuring the circumference of your finger. Wrap a thin strip of paper or a piece of string snugly around the base of the finger, mark where it overlaps, then measure that length with a ruler in millimeters.
Yes. Ring Size from Circumference is completely free, with no sign-up and no usage limits.
Yes. Ring Size from Circumference runs in any modern web browser. There is nothing to download or install.
Yes. Ring Size from Circumference runs entirely on your device in your browser, so nothing you enter is uploaded to a server.