Take a ring that fits perfectly and lay it on a piece of paper. Draw the inside circle.

Measure the diameter (if needed do the conversion into millimeter/mm) then multiply it by 3.14.

This number (in mm, rounded above) corresponds to your ring size. 

Example: the diameter is 16.1mm, my size is: 16.1 x 3.14=50.55mm, which is a size 51.

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If you do know your size in another measurements system, you can report to the conversion chart.

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You want to make a present but you don't know their size?

Check the gift cards section!