Ring Size System Conversion
thingiverse
Convert various ring size systems (e.g., US+Can, UK+IE+AUS+NZ, IND+CHN, Swiss) using a spreadsheet tool and calculate the internal diameter in mm. Get linear best fit equations from data found at http://en.wikipedia.org/wiki/Ring_size. Combine with a ring creation script (thingiverse.com/thing:12448), diamond size shape weight conversion Spreadsheet (thingiverse.com/thing:12586), and metal cost calculator (thingiverse.com/thing:12589) for custom engagement ring costing. Note that the converted values are indicative, and professional advice is recommended. The spreadsheet also provides a conversion table, but bear in mind that sizes may round up to the next available size in certain systems, and different systems start and end at varying points. Be cautious of very small or large sizes, and take responsibility for any errors or changes in finger size over time.
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