Useful for
Useful for jewellery purchases, sizing a ring at home and comparing international sizing charts.
ring size converter
Convert inside diameter, circumference and common US or EU ring sizes.
ring size
What this tool handles
Convert inside diameter, circumference and common US or EU ring sizes.
diameter mmcircumference mmUSEU
Conversion model
A measured diameter can be turned into circumference first, then into a ring-size estimate, giving you a clear path from a physical measurement to a retail size.