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MM to Inches Converter

Type a value in millimeters to get inches instantly, or type in the inches box to convert back. The formula with your number, related units and full tables are below.

MillimetersFrom

InchesTo

Decimal places

Step-by-step calculation

How to use the MM to Inches Converter

Type a value in the Millimeters box. The inches result appears instantly.
Going the other way? Type in the Inches box, or press the ⇄ swap button.
Set the precision with the decimal places menu.
Check the working in the step-by-step box, then press Copy result or click any row in the tables below.

Millimeters to inches formula

in = mm ÷ 25.4

Take the value in millimeters.
Divide it by 25.4 (the number of millimeters in one inch).

Example: 50 mm ÷ 25.4 = 1.9685 in.

Reverse formula (inches to millimeters): mm = in × 25.4. Example: 1 in × 25.4 = 25.4 mm.

Quick mental estimate: divide by about 25. For exact answers use the converter above.

mm to in conversion table (1–100)

Click any row to load it into the converter.

Millimeters to inches

Millimeters	Inches
1 mm	0.0394 in
2 mm	0.0787 in
3 mm	0.1181 in
4 mm	0.1575 in
5 mm	0.1969 in
6 mm	0.2362 in
7 mm	0.2756 in
8 mm	0.315 in
9 mm	0.3543 in
10 mm	0.3937 in
11 mm	0.4331 in
12 mm	0.4724 in
13 mm	0.5118 in
14 mm	0.5512 in
15 mm	0.5906 in
16 mm	0.6299 in
17 mm	0.6693 in
18 mm	0.7087 in
19 mm	0.748 in
20 mm	0.7874 in
21 mm	0.8268 in
22 mm	0.8661 in
23 mm	0.9055 in
24 mm	0.9449 in
25 mm	0.9843 in
26 mm	1.0236 in
27 mm	1.063 in
28 mm	1.1024 in
29 mm	1.1417 in
30 mm	1.1811 in
31 mm	1.2205 in
32 mm	1.2598 in
33 mm	1.2992 in
34 mm	1.3386 in
35 mm	1.378 in
36 mm	1.4173 in
37 mm	1.4567 in
38 mm	1.4961 in
39 mm	1.5354 in
40 mm	1.5748 in
41 mm	1.6142 in
42 mm	1.6535 in
43 mm	1.6929 in
44 mm	1.7323 in
45 mm	1.7717 in
46 mm	1.811 in
47 mm	1.8504 in
48 mm	1.8898 in
49 mm	1.9291 in
50 mm	1.9685 in
51 mm	2.0079 in
52 mm	2.0472 in
53 mm	2.0866 in
54 mm	2.126 in
55 mm	2.1654 in
56 mm	2.2047 in
57 mm	2.2441 in
58 mm	2.2835 in
59 mm	2.3228 in
60 mm	2.3622 in
61 mm	2.4016 in
62 mm	2.4409 in
63 mm	2.4803 in
64 mm	2.5197 in
65 mm	2.5591 in
66 mm	2.5984 in
67 mm	2.6378 in
68 mm	2.6772 in
69 mm	2.7165 in
70 mm	2.7559 in
71 mm	2.7953 in
72 mm	2.8346 in
73 mm	2.874 in
74 mm	2.9134 in
75 mm	2.9528 in
76 mm	2.9921 in
77 mm	3.0315 in
78 mm	3.0709 in
79 mm	3.1102 in
80 mm	3.1496 in
81 mm	3.189 in
82 mm	3.2283 in
83 mm	3.2677 in
84 mm	3.3071 in
85 mm	3.3465 in
86 mm	3.3858 in
87 mm	3.4252 in
88 mm	3.4646 in
89 mm	3.5039 in
90 mm	3.5433 in
91 mm	3.5827 in
92 mm	3.622 in
93 mm	3.6614 in
94 mm	3.7008 in
95 mm	3.7402 in
96 mm	3.7795 in
97 mm	3.8189 in
98 mm	3.8583 in
99 mm	3.8976 in
100 mm	3.937 in

Inches to millimeters

Inches	Millimeters
1 in	25.4 mm
2 in	50.8 mm
3 in	76.2 mm
4 in	101.6 mm
5 in	127 mm
6 in	152.4 mm
7 in	177.8 mm
8 in	203.2 mm
9 in	228.6 mm
10 in	254 mm
11 in	279.4 mm
12 in	304.8 mm
13 in	330.2 mm
14 in	355.6 mm
15 in	381 mm
16 in	406.4 mm
17 in	431.8 mm
18 in	457.2 mm
19 in	482.6 mm
20 in	508 mm
21 in	533.4 mm
22 in	558.8 mm
23 in	584.2 mm
24 in	609.6 mm
25 in	635 mm
26 in	660.4 mm
27 in	685.8 mm
28 in	711.2 mm
29 in	736.6 mm
30 in	762 mm
31 in	787.4 mm
32 in	812.8 mm
33 in	838.2 mm
34 in	863.6 mm
35 in	889 mm
36 in	914.4 mm
37 in	939.8 mm
38 in	965.2 mm
39 in	990.6 mm
40 in	1,016 mm
41 in	1,041.4 mm
42 in	1,066.8 mm
43 in	1,092.2 mm
44 in	1,117.6 mm
45 in	1,143 mm
46 in	1,168.4 mm
47 in	1,193.8 mm
48 in	1,219.2 mm
49 in	1,244.6 mm
50 in	1,270 mm
51 in	1,295.4 mm
52 in	1,320.8 mm
53 in	1,346.2 mm
54 in	1,371.6 mm
55 in	1,397 mm
56 in	1,422.4 mm
57 in	1,447.8 mm
58 in	1,473.2 mm
59 in	1,498.6 mm
60 in	1,524 mm
61 in	1,549.4 mm
62 in	1,574.8 mm
63 in	1,600.2 mm
64 in	1,625.6 mm
65 in	1,651 mm
66 in	1,676.4 mm
67 in	1,701.8 mm
68 in	1,727.2 mm
69 in	1,752.6 mm
70 in	1,778 mm
71 in	1,803.4 mm
72 in	1,828.8 mm
73 in	1,854.2 mm
74 in	1,879.6 mm
75 in	1,905 mm
76 in	1,930.4 mm
77 in	1,955.8 mm
78 in	1,981.2 mm
79 in	2,006.6 mm
80 in	2,032 mm
81 in	2,057.4 mm
82 in	2,082.8 mm
83 in	2,108.2 mm
84 in	2,133.6 mm
85 in	2,159 mm
86 in	2,184.4 mm
87 in	2,209.8 mm
88 in	2,235.2 mm
89 in	2,260.6 mm
90 in	2,286 mm
91 in	2,311.4 mm
92 in	2,336.8 mm
93 in	2,362.2 mm
94 in	2,387.6 mm
95 in	2,413 mm
96 in	2,438.4 mm
97 in	2,463.8 mm
98 in	2,489.2 mm
99 in	2,514.6 mm
100 in	2,540 mm

Common values

Millimeters	Inches	Example
1 mm	0.04 in	1 mm
3 mm	0.12 in	3 mm
5 mm	0.2 in	5 mm
6.35 mm	0.25 in	Quarter inch
10 mm	0.39 in	1 centimeter
12.7 mm	0.5 in	Half inch
25.4 mm	1 in	1 inch
50 mm	1.97 in	5 cm
100 mm	3.94 in	10 cm
210 mm	8.27 in	A4 paper width
297 mm	11.69 in	A4 paper height
500 mm	19.69 in	Half a meter
1,000 mm	39.37 in	1 meter

About millimeters and inches

Millimeters (mm). The millimeter is one thousandth of a meter. It is used for small, precise measurements such as screws, rainfall, paper and engineering drawings.

Inches (in). The inch is a US customary and imperial length unit. Since 1959 it has been defined as exactly 2.54 centimeters, and 12 inches make a foot.

Frequently asked questions

How many inches are in a millimeter?

One millimeter equals 0.0393701 inches. Looking at it the other way, one inch is 25.4 millimeters.

How do you convert millimeters to inches?

Divide the number of millimeters by 25.4. For example, 50 mm ÷ 25.4 = 1.9685 in.

What is 25.4 millimeters in inches?

25.4 mm is 1 in (1 inch).

How much is 500 millimeters in inches?

500 millimeters equals 19.685 inches.

How do I convert inches back to millimeters?

Multiply by 25.4, or press the ⇄ swap button above. For example, 1 in × 25.4 = 25.4 mm.

Is the conversion exact?

Yes. Since the 1959 international yard and pound agreement, 1 inch is exactly 2.54 cm, 1 foot exactly 0.3048 m, 1 yard exactly 0.9144 m and 1 mile exactly 1,609.344 m. The old US survey foot (1200/3937 m) was officially retired at the end of 2022.

How do I write feet and inches?

Feet are marked with a single prime (′ or ') and inches with a double prime (″ or "), so 5′ 10″ means 5 feet 10 inches, which is 70 inches or 177.8 cm.

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