Ring Size Converter
Convert between international ring size systems: US, UK, EU, Japan, and more. Includes finger measurement guide.
Professional Jewelry Standard
(US)
mm
Inside diameter
mm
Finger measurement
mm
Width of ring band
mm
Metal thickness
°C
Current temperature
°C
Typical wearing temperature
Converted Ring Size
US 7 = UK O½ = EU 54 = Japan 13
Diameter: 17.3mm • Circumference: 54.5mm
Australia: O • Switzerland: 13.5 • Italy: 9
