There are several systems for indicating a rings size used around the world.
Size 4 ring dimensions.
While each of these ring size methods is fast convenient and free there may be accuracy discrepancies due to things such as printer settings or stretch of the string.
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In the united states canada and mexico for indicating a rings size uses a numerical measure for whole and half rings sizes an increase of a full ring size is an increase of 0 032 inch 0 8128 mm in diameter or roughly 1 10 inch in inside circumference.
Consider using more than one ring size method for a measure twice cut once approach to ring sizing.
With standard ring sizes every half size matches up to a 0 4 millimeter increment starting with size 3 equaling 14 mm size 3 5 equal to 14 4 mm size 4 equal to 14 8 mm and so on.
Common ring sizes for women are 6 16 5 mm 6 5 16 9 mm and 7 17 3 mm.