Convertitore Taglia Anello — Formula

Ring Size Conversion

Ring sizes vary by country. The US system uses numbers (typically 3-16), while the UK uses letters and EU uses circumference in mm minus 40.

Approximate Formula

Diameter (mm) = 11.63 + (US Size - 3) x 0.814

Circumference = Diameter x pi

EU Size = Circumference - 40

Quick Reference

USDiameter (mm)EU 515.749 717.354 919.060

Esempio Risolto

Convert US size 7 to other systems.

  1. Diameter = 11.63 + (7-3) x 0.814 = 14.886 mm
  2. Wait, let me recalculate: 11.63 + 4 x 0.814 = 14.886 mm
  3. Circumference = 14.886 x pi = 46.76 mm
  4. EU size = 46.76 - 40 = ~7