mm to inches Converter

Millimeter (mm):

The millimeter (mm) is one of the smallest commonly used metric units. It’s frequently used in engineering, machining, and manufacturing where fine tolerances matter. Architects, engineers, and product designers rely on millimeters for accuracy in drawings and specifications.

Inch (in):

The inch (in) is a unit in the imperial and U.S. customary systems—one inch is exactly 2.54 centimeters. It’s the standard for describing screen sizes, hardware, clothing measurements in some contexts, and many common household dimensions. Twelve inches make a foot, which is heavily used in construction and daily life in the U.S.

How to convert millimeters to inches

Option 1: The fastest way – Use our converter

For instant results, just type your measurement into the mm to in converter at the top of this page. It's quick, accurate, and hassle-free.

Option 2: The diy way – Use the formula

If you prefer to calculate it yourself, it's straightforward. You only need to remember one number: 25.4. This is because one millimeter is internationally defined as 1 divided by 25.4 inch.

The formula is simple:

Inches = Millimeters ÷ 25.4

Here's how to do it:

Take your measurement in millimeters.

Divide that number by 25.4.

The answer is the measurement in inches.

Example: Let's convert 10 mm to in.

Calculate: 10 ÷ 25.4 = 0.3937

Result: equals 0.3937 in

It's really that easy.

Popular length unit conversions

mm to inches conversion table

Millimeters (mm)	Inches (in)
1 mm	0.03937 in
2 mm	0.07874 in
3 mm	0.11811 in
4 mm	0.15748 in
5 mm	0.19685 in
6 mm	0.23622 in
7 mm	0.275591 in
8 mm	0.314961 in
9 mm	0.354331 in
10 mm	0.393701 in
11 mm	0.433071 in
12 mm	0.472441 in
13 mm	0.511811 in
14 mm	0.551181 in
15 mm	0.590551 in
16 mm	0.629921 in
17 mm	0.669291 in
18 mm	0.708661 in
19 mm	0.748031 in
20 mm	0.787402 in
21 mm	0.826772 in
22 mm	0.866142 in
23 mm	0.905512 in
24 mm	0.944882 in
25 mm	0.984252 in
26 mm	1.023622 in
27 mm	1.062992 in
28 mm	1.102362 in
29 mm	1.141732 in
30 mm	1.181102 in
31 mm	1.220472 in
32 mm	1.259843 in
33 mm	1.299213 in
34 mm	1.338583 in
35 mm	1.377953 in
36 mm	1.417323 in
37 mm	1.456693 in
38 mm	1.496063 in
39 mm	1.535433 in
40 mm	1.574803 in
41 mm	1.614173 in
42 mm	1.653543 in
43 mm	1.692913 in
44 mm	1.732283 in
45 mm	1.771654 in
46 mm	1.811024 in
47 mm	1.850394 in
48 mm	1.889764 in
49 mm	1.929134 in
50 mm	1.968504 in

Millimeters (mm)	Inches (in)
51 mm	2.007874 in
52 mm	2.047244 in
53 mm	2.086614 in
54 mm	2.125984 in
55 mm	2.165354 in
56 mm	2.204724 in
57 mm	2.244094 in
58 mm	2.283465 in
59 mm	2.322835 in
60 mm	2.362205 in
61 mm	2.401575 in
62 mm	2.440945 in
63 mm	2.480315 in
64 mm	2.519685 in
65 mm	2.559055 in
66 mm	2.598425 in
67 mm	2.637795 in
68 mm	2.677165 in
69 mm	2.716535 in
70 mm	2.755906 in
71 mm	2.795276 in
72 mm	2.834646 in
73 mm	2.874016 in
74 mm	2.913386 in
75 mm	2.952756 in
76 mm	2.992126 in
77 mm	3.031496 in
78 mm	3.070866 in
79 mm	3.110236 in
80 mm	3.149606 in
81 mm	3.188976 in
82 mm	3.228346 in
83 mm	3.267717 in
84 mm	3.307087 in
85 mm	3.346457 in
86 mm	3.385827 in
87 mm	3.425197 in
88 mm	3.464567 in
89 mm	3.503937 in
90 mm	3.543307 in
91 mm	3.582677 in
92 mm	3.622047 in
93 mm	3.661417 in
94 mm	3.700787 in
95 mm	3.740157 in
96 mm	3.779528 in
97 mm	3.818898 in
98 mm	3.858268 in
99 mm	3.897638 in
100 mm	3.937008 in