How big are Millimeters (MM)?



A good formula to use to find inches from millimeters is to take the number of mm and divide it by 25.4 because 1 Inch = 25.4mm.

Using this formula a 40x30 cabochon is approximately 1.574x1.181 inches.

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Millimeters (mm) Inches (in) 1 .038 2 .078 3 .118 4 .157 5 .196 6 .236 7 .275 8 .314 9 .354 10 .393 11 .433 12 .472 13 .511 14 .551 15 .590 16 .629 17 .669 18 .708 19 .748 20 .787 21 .826 22 .866 23 .905 24 .944 25 .984 26 1.023 27 1.062 28 1.102 29 1.141 30 1.181 31 1.220 32 1.259 33 1.299 34 1.338 35 1.399 36 1.417 37 1.456 38 1.496 39 1.535 40 1.574

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