Calculators
Ring size calculator from circumference or diameter
Estimate a US ring size from finger circumference or the inside diameter of a fitting ring in millimeters.
Processed locally
Measure finger circumference with a flexible tape, or the inside diameter of a fitting ring, not your finger’s diameter. Approximate US size using Tiffany’s chart; try the fit before buying.
Reference
TiffanyHelp and method
The reference range is US 3–13. Do not confuse diameter with circumference or pull the tape tight. Between rows we show the larger size; band width and knuckles can affect fit.
Methods and reliabilityWorked example
An example you can try or adapt to your own values.
- Finger circumference
- 54.4 mm
Result
US 7