Easy Ways to Calculate Bead Sizes - The Spruce Crafts
https://www.thesprucecrafts.com/bead-size-chart-339887
Jan 26, 2021 · One penny is 1.52 millimeters thick. This gives you a point of reference for bead size. If you stack two pennies together, you can estimate how big a 3 mm sized bead is or use a stack of four to estimate the size of a 6 mm bead. If you are out of pennies, nickels are another good reference. Nickels, at 1.95 mm thick, are just shy of 2 mm.
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