Ring Size Measuring Tool
thingiverse
A Simple Guide to Measuring Your Finger for the Perfect Ring Size Get a precise measurement of your finger to determine your ideal ring size with ease. 15 accurate sizes available (from 3.5 to 10 in half-point increments) Ring measurements are calculated using a standard formula applicable across US, Canada, and Mexico: US, Canada, Mexico: Calculate the ring's inner circumference by adding 36.5 mm to 2.55 mm multiplied by your ring size. US, Canada, Mexico: Determine the ring's diameter by adding 11.63 mm to 0.8128 mm multiplied by your ring size. Refer to this chart for precise measurements: https://en.wikipedia.org/wiki/Ring_size
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