Jewellery

Ring Size Converter

Convert ring sizes between US, UK, and EU systems using inner circumference or diameter.

Important

Ring sizes vary between manufacturers and countries. Width of the band, time of day, and temperature affect fit. Use this as a starting point and confirm with a jeweller.

Inner circumference (mm)

Inner diameter

17.19 mm

US / Canada

9.2

UK / Australia

16.2

EU / ISO

54.0

How to measure

Wrap a thin strip of paper around the base of your finger.
Mark where the strip overlaps.
Measure the length in millimetres to get the circumference.
Measure at the end of the day when fingers are slightly larger.

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