Ring Size from Finger 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. 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.
How to use Ring Size from Circumference
- Wrap paper or string around your finger and mark the overlap.
- Measure the marked length in mm as the circumference.
- Enter the circumference or a known diameter.
- Read your US, UK, and EU ring size.
Frequently asked questions
How do I measure my finger at home?
Wrap a thin strip of paper or string around the base of your finger, mark where it overlaps, and measure that length in mm to get the circumference.
Can I enter diameter instead?
Yes, if you measure the inside diameter of an existing ring you can enter that, and the tool converts it to circumference and a ring size.
When is the best time to measure?
Measure when your hands are warm and at the end of the day, since fingers shrink in the cold and can be smaller in the morning.
What is Ring Size from Circumference?
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.
Is Ring Size from Circumference free to use?
Yes. Ring Size from Circumference is completely free, with no sign-up and no usage limits.
Does Ring Size from Circumference work in a web browser?
Yes. Ring Size from Circumference runs in any modern web browser. There is nothing to download or install.
Is my data private with Ring Size from Circumference?
Yes. Ring Size from Circumference runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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