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Home » Learning Center » mm to Inches
Gemologica Learning Center   · Diamonds
  · Gemstones
  · Gold
  · Settings
   · Stone Size
  · Ring Size
  · MM to Inches
  · Glossary

MM to Inches Conversion

It's quite common to see the size of jewelry pieces in millimeters (MM), although many people want to know the size in inches. If you would like to know inches instead of millimeters, a straightforward formula can help you figure it out:

Simply take the number of millimeters and divide by 25.4. You will then get a decimal that can be converted to an inch. Example: 40 millimeters is approximately 1.6 inches, calculated as 40 ÿ 25.4 = 1.57 inch.

The following chart demonstrates common conversions for easy reference:

Millimeters Inches
1 Millimeter 0.04 Inches
2 Millimeters 0.08 Inches
3 Millimeters 0.12 Inches
4 Millimeters 0.16 Inches
5 Millimeters 0.20 Inches
6 Millimeters 0.24 Inches
7 Millimeters 0.28 Inches
8 Millimeters 0.31 Inches
9 Millimeters 0.35 Inches
10 Millimeters 0.39 Inches
11 Millimeters 0.43 Inches
12 Millimeters 0.47 Inches
13 Millimeters 0.51 Inches
14 Millimeters 0.55 Inches
15 Millimeters 0.59 Inches
16 Millimeters 0.63 Inches
17 Millimeters 0.67 Inches
18 Millimeters 0.71 Inches
19 Millimeters 0.75 Inches
20 Millimeters 0.79 Inches
21 Millimeters 0.83 Inches
22 Millimeters 0.87 Inches
23 Millimeters 0.91 Inches
24 Millimeters 0.94 Inches
25 Millimeters 0.98 Inches
26 Millimeters 1.02 Inches
27 Millimeters 1.06 Inches
28 Millimeters 1.10 Inches
29 Millimeters 1.14 Inches
30 Millimeters 1.18 Inches
31 Millimeters 1.22 Inches
32 Millimeters 1.26 Inches
33 Millimeters 1.30 Inches
34 Millimeters 1.34 Inches
35 Millimeters 1.38 Inches
36 Millimeters 1.42 Inches
37 Millimeters 1.46 Inches
38 Millimeters 1.50 Inches
39 Millimeters 1.54 Inches
40 Millimeters 1.57 Inches


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Gemologica’s jewelry store specializes in gemstone jewelry, gold jewelry, stainless steel jewelry and titanium jewelry, with a wide selection of earrings, rings, bracelets, necklaces and pendants.