Ring Sizer is a tool that allows you to measure the current size of a physical ring in different standards. The application provides the most commonly used standards, from around the world, and it is also possible to select the type of measurements, to be shown in the app. The Ring Sizer App displays three alternative measurements of how large a ring will be. In the standard, the internal perimeter length, internal diameter, and actual dimension will be shown in these varied numbers. You can view measurements in either metric or imperial units. Depending on the choice you select, the ruler will display different marks.