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The following table will convert the circumference to various ring size systems:
AU, NZ and UK size = (circumference in mm – 36.667) x .8085
1 = A, 2 = B, etc
USA size = (circumference in mm – 36.107) x .3862
Singapore & Europe size = circumference in mm
Japan size = (circumference in mm – 39.7946) x .9549
When measuring a customer’s finger size you must be aware of the width of the ring sizer you are using.
When a customer is purchasing a 3mm wide ring and you are using a 3mm wide ring sizer, the size remains that which was measured.
If you are using a 3mm wide ring sizer but the ring purchased is 5mm wide, then you must add half a size for every 2mm variance in width.
Remember our rings are sized to the leading edge and a wider "Comfort Curve™" ring appears slightly larger because the centre of the ring touches the ring stick first.
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PO Box 198
Maribyrnong, VIC 3032