cm to Ring Size Converter

Your details

Circumference: wrap a strip of paper around your finger and measure its length. Diameter: measure across the inside of an existing ring.
Enter the circumference or diameter of your finger (or existing ring) in centimetres.
cm
US / Canada sizeUS size 6
6

Standard American ring sizing used in the US and Canada

UK / Australia sizeM
France / Russia size52 3/4
Germany size16 1/2
Switzerland size12
Japan size12 3/4
Inside diameter16.51mm
Finger circumference51.87mm
16.51 mm
Very small (US 1-2)<14.5Small (US 3-5)14.5-17Medium (US 6-9)17-19.5Large (US 10-11)19.5-21.5Extra large (US 12-13)21.5+

Closest US ring size: 6

  • A finger circumference of 5.19 cm matches an inside diameter of 16.5 mm.
  • In the UK and Australia this is size M; in the US and Canada it is size 6.
  • The French/Russian equivalent is size 52 3/4, which is the inside circumference in millimetres (rounded to a standard).
  • Ring sizes vary slightly by brand and metal - if in doubt, go half a size up, especially for wide bands which fit tighter.

Next stepFor the most accurate result, have a jeweller measure your finger with a ring mandrel, especially for a significant purchase.

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