Spike's Calculators

US Ring Sizes

Throughout the world, there are different systems in use to specify the size of a ring. In North America, which includes Mexico, Canada, and the United States, the ring sizes use a numerical scale with increments of ¼ inch.

There are several different calculators that use a finger's diameter or circumference measurement, and calculations can be done using Imperial or Metric measurements, with the Imperial measurement in inches and the Metric in millimetres.

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