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Inches to MM Converter

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

InchesFrom

MillimetersTo

Decimal places

Step-by-step calculation

How to use the Inches to MM Converter

Type a value in the Inches box. The millimeters result appears instantly.
Going the other way? Type in the Millimeters 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.

Inches to millimeters formula

mm = in × 25.4

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

Example: 12 in × 25.4 = 304.8 mm.

Reverse formula (millimeters to inches): in = mm ÷ 25.4. Example: 914.4 mm ÷ 25.4 = 36 in.

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

in to mm conversion table (1–100)

Click any row to load it into the converter.

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

Millimeters to inches

Millimeters	Inches
1 mm	0.04 in
2 mm	0.08 in
3 mm	0.12 in
4 mm	0.16 in
5 mm	0.2 in
6 mm	0.24 in
7 mm	0.28 in
8 mm	0.31 in
9 mm	0.35 in
10 mm	0.39 in
11 mm	0.43 in
12 mm	0.47 in
13 mm	0.51 in
14 mm	0.55 in
15 mm	0.59 in
16 mm	0.63 in
17 mm	0.67 in
18 mm	0.71 in
19 mm	0.75 in
20 mm	0.79 in
21 mm	0.83 in
22 mm	0.87 in
23 mm	0.91 in
24 mm	0.94 in
25 mm	0.98 in
26 mm	1.02 in
27 mm	1.06 in
28 mm	1.1 in
29 mm	1.14 in
30 mm	1.18 in
31 mm	1.22 in
32 mm	1.26 in
33 mm	1.3 in
34 mm	1.34 in
35 mm	1.38 in
36 mm	1.42 in
37 mm	1.46 in
38 mm	1.5 in
39 mm	1.54 in
40 mm	1.57 in
41 mm	1.61 in
42 mm	1.65 in
43 mm	1.69 in
44 mm	1.73 in
45 mm	1.77 in
46 mm	1.81 in
47 mm	1.85 in
48 mm	1.89 in
49 mm	1.93 in
50 mm	1.97 in
51 mm	2.01 in
52 mm	2.05 in
53 mm	2.09 in
54 mm	2.13 in
55 mm	2.17 in
56 mm	2.2 in
57 mm	2.24 in
58 mm	2.28 in
59 mm	2.32 in
60 mm	2.36 in
61 mm	2.4 in
62 mm	2.44 in
63 mm	2.48 in
64 mm	2.52 in
65 mm	2.56 in
66 mm	2.6 in
67 mm	2.64 in
68 mm	2.68 in
69 mm	2.72 in
70 mm	2.76 in
71 mm	2.8 in
72 mm	2.83 in
73 mm	2.87 in
74 mm	2.91 in
75 mm	2.95 in
76 mm	2.99 in
77 mm	3.03 in
78 mm	3.07 in
79 mm	3.11 in
80 mm	3.15 in
81 mm	3.19 in
82 mm	3.23 in
83 mm	3.27 in
84 mm	3.31 in
85 mm	3.35 in
86 mm	3.39 in
87 mm	3.43 in
88 mm	3.46 in
89 mm	3.5 in
90 mm	3.54 in
91 mm	3.58 in
92 mm	3.62 in
93 mm	3.66 in
94 mm	3.7 in
95 mm	3.74 in
96 mm	3.78 in
97 mm	3.82 in
98 mm	3.86 in
99 mm	3.9 in
100 mm	3.94 in

Common values

Inches	Millimeters	Example
1 in	25.4 mm	1 inch
3 in	76.2 mm	Quarter of a foot
6 in	152.4 mm	Half a foot
8.5 in	215.9 mm	US Letter paper width
11 in	279.4 mm	US Letter paper height
12 in	304.8 mm	1 foot (ruler)
24 in	609.6 mm	2 feet
36 in	914.4 mm	1 yard
55 in	1,397 mm	55-inch TV (diagonal)
60 in	1,524 mm	5 feet
66 in	1,676.4 mm	5 ft 6 in
72 in	1,828.8 mm	6 feet
80 in	2,032 mm	Standard US door height

About inches and millimeters

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.

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.

Frequently asked questions

How many millimeters are in an inch?

One inch equals 25.4 millimeters.

How do you convert inches to millimeters?

Multiply the number of inches by 25.4. For example, 12 in × 25.4 = 304.8 mm.

What is 36 inches in millimeters?

36 in is 914.4 mm (1 yard).

How do I convert millimeters back to inches?

Divide by 25.4, or press the ⇄ swap button above. For example, 914.4 mm ÷ 25.4 = 36 in.

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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