Spike's Calculators

United States Ring Sizes

Get the US and Canadian ring sizes from an inside circumference measurement in inches.

US Ring Sizes

The calculator provides the ring sizes up to and including size 18 1/4. If you enter a larger size, it will only give the inside diameter of the ring.
Inside Circunmference in n


Diameter in decimal inch dec. in
Diameter in inches in
US ring size #


  1. enter the inside circumference measurement


  1. ring diameter in decimal inch
  2. diameter in inch and fraction
  3. the US and Canadian ring size
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