Ring size conversion chart for ring sizes from the United States, UK, Italy, France, Spain, Germany and Japan.

The most complete and #1 source for your ring size conversions. Accurately determine what ring size you are in all international sizing standards.

Use our free ring size converter to determine your ring size by circumference or diameter

Determine your ring size with our conversion chart. Conversions are available for United Kingdom, France, Russia, German, Swiss, Japan and United States ring sizes.

Your US ring size (in comfort fit) is ___ *Disclaimer: Please understand that this conversion tool and chart is provided as is without any guarantees. Its purpose is to give you a general idea of your ring size.

Our Ring Size Conversion Chart simplifies the process by showing the equivalent sizes between different measurement systems. This chart helps you quickly convert between US, UK, European, and other systems, making it easier to find your perfect fit.

You can use the US ring size chart below in two different ways, both for determining your ring size based on finger measurement (easily measured at home, see below), or finding the ring size of a already perfect fitting ring (so that you can buy the same size again).

The calculator will allow you to convert between the ring sizes for Europe (ISO), US, UK, Japan, Swiss and Russia. We also added the option to use the inside circumference/diameter of ring in millimeters or inches if it’s needed.

Already know your ring size, but your favorite jeweler works with different ring size scale? use the table below to find your ring size in the desired scale. The table contains the most commonly used ring size scales. If your desired ring size scale is missing, please update us and we'll add it.

US Ring Size System - This system is based on the non-metric British inch and is used not only in the US, but in Canada and Mexico as well. UK Ring Size System -This system is also used by …