Spike's Calculators

US Ring Size Calculator

Find the size of the ring you need from a circumference measurement of your finger.

This type of ring sizing is used in Canada, Mexico, and the United States.

In addition to the size of the ring you need, this calculator will provide the ring's inside diameter based on your finger's circumference.

In this calculator 1 7/16" is a size 1/8 ring and on the upper end, 4 7/16" is a size 30 ring

US Ring Size from Circumference

Finger's Circumference in n


Inside ring circumference in decimal inches dec.in
Inside ring diameter dec.in
Inside ring diameter in
US ring size #
US ring size #


  1. enter the finger's circumference measurement using inch and fraction


  1. inside ring circumference in decimal inch
  2. the inside diameter of the ring in decimal inches
  3. the inside diameter of the ring in inch and fraction
  4. the US/Canadian ring size
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