Spike's Calculators

US Ring Size from Diameter in Millimetres

Find the size of the ring you need from a diameter measurement in millimetres of your finger.

The US ring size is used in North America, including Mexico, Canada, and the United States.

In addition to the size of the ring you need, this calculator will provide the ring's inside circumference.

In this calculator, 11.45 is a size 0 ring and at the upper end, 36.017 is a size 30 ring

Ring Size Metric, from Diameter

Diameter of finger mm


Inside ring circumference mm
US ring size #
US ring size #


  1. enter a finger's diameter measurement in millimetres


  1. inside ring circumference in millimetres
  2. US ring size
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