Consumer ring size guide
How to measure ring size at home
Four practical methods, one rule: measure twice before you buy.
Method 1 · most reliable at home
Measure a ring that already fits
Place the ring on a ruler and measure the inner diameter at its widest point. Do not include the metal edge.
Enter the diameterMethod 2 · calibrated print
Use a printable ring sizer
Print at 100%, verify the 50 mm calibration line, then match only the inside edge of a fitting ring.
Open printable guideMethod 3 · no ring available
Measure with paper or string
Wrap a narrow strip around the finger without stretching it, mark the overlap, then measure the length in millimeters. Repeat because tension changes the result.
Match circumferenceMethod 4 · guided phone flow
Measure with an online or iPhone tool
Use a guided tool to convert diameter or circumference. Screen-based sizing still needs calibration and a second check.
Get the iPhone appAvoid common errors
Why two measurements can disagree
Cold fingers, swollen hands, loose paper, printer scaling, wide bands, and regional conversion tables can all shift the recommendation.
- Measure late in the day when your fingers are at a normal temperature.
- Use an existing ring, a calibrated printable, or a snug paper strip.
- Measure twice and use millimeters before converting to a regional size.
- Confirm with the jeweler when the ring is wide, valuable, or hard to resize.