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Everyday Life Calculators
Ring Size Converter
Convert a finger’s circumference measurement into an approximate US ring size.
Approximate US ring size
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Diameter
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About the Ring Size Converter
Ring size is based on the inside circumference of the band. This calculator uses a simplified linear approximation of the standard US ring size chart to estimate size from a circumference measurement.
Formula: US Ring Size ≈ 3 + (Circumference in mm − 44.2) ÷ 2.4
To measure, wrap a strip of paper or string around the base of the finger and measure its length in millimeters. For best accuracy, get sized in person at a jeweler.
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