To determine your ring size at home, use a simple string or paper method for an accurate measurement. This approach works well for most people and requires minimal tools.
String Method
Wrap a thin string or strip of paper snugly around the base of your finger, ideally the one for the ring. Mark where the ends meet, then measure the length in millimeters and divide by 3.14 (pi) to find the inner diameter—match this to a standard ring size chart. For best results, measure in the evening when fingers are slightly swollen, and take three readings to average them.
Existing Ring Method
If you have a ring that fits perfectly, place it over a printable ring size chart or measure its inner diameter with a ruler or caliper. Compare the diameter directly to charts for US, UK, or other sizing systems, noting that sizes vary by region (e.g., US 6 is about 16.5mm circumference). Avoid forcing it over the knuckle; the fit should slide on easily but feel secure.
Tips for Accuracy
- Fingers change size with temperature, weight, or time of day—opt for a professional jeweler sizer for precision if possible.
- Free printable charts or mailed sizers are available from many jewelers.
- Test the fit by ensuring you can rotate the ring and fit a fingertip underneath comfortably.