Convert a Ring Size

For UK enter a letter like , Q or Z+1. Everything else is a number.
US / Canada
UK / Ireland
EU / ISO
Japan
Diameter
Circumference
How to measure at home: wrap a strip of paper or a piece of string around the base of the finger, mark where it overlaps, and measure the length in millimetres — that is the inside circumference. Measure at the end of the day when fingers are largest, and size up if a knuckle is wide. A jeweller’s sizing gauge is always the most accurate.

Selling rings online?

Lustriel gives Stuller retailers a calm, step-by-step ring configurator with exact media and live pricing — so customers choose the right ring, and the right size, with confidence.