Millimeters (mm) to Inches (in) Converter

This length unit converter dynamically calculates a value you enter in millimeters (mm) and converts it to its equivalent value in inches (in).

How many millimeters (mm) are in an inch (in)? What is the formula for how to convert millimeters to inches (mm to in)?

1 millimeter (mm) = 0.039370078740157 inch (in)
So we can say that there is 0.039370078740157 inch in 1 millimeter.
This means that the multiplication conversion factor to convert a quantity expressed in a millimeter unit of measurement to an equivalent quantity expressed in an inch unit of measurement is 0.039370078740157.

Inversely (or reciprocally),

1 inch (in) = 25.4 millimeters (mm)
So we can say that there is 25.4 millimeters in 1 inch.
This means that the division conversion factor to convert a quantity expressed in a millimeter unit of measurement to an equivalent quantity expressed in an inch unit of measurement is 25.4.

Knowing this inverse mathematical relationship between the two conversion factors and their reciprocal operations, we can derive two formulas to calculate and convert a quantity of length expressed in millimeters to an equivalent quantity of length expressed in inches (mm to in). Both formulas will yield the same result. The formulas are:

in = mm ร— 0.039370078740157 ย  ย โ†’ This is the formula based on the multiplication conversion factor.

and

in = mm รท 25.4 ย  ย โ†’ This is the formula based on the division conversion factor.

For example, if you have a length of 250 millimeters that you want to convert to inches, you would use either of the two formulas as follows:

in = 250 mm ร— 0.039370078740157 = 9.842519685 in
in = 250 mm รท 25.4 = 9.842519685 in

So, the result is the same using either formula, which is 9.842519685 inches.

Millimeters to inches (mm to in) conversion chart

To save you time and effort spent on having to perform manual calculations or look up conversion formulas every time a conversion from millimeters to inches is needed, here is a millimeters-to-inches conversion chart for your quick and easy reference. This conversion chart (or conversion table) shows common measurement values of length in millimeters and their equivalent measurement values in inches. These equivalent measurement values may be rounded off to 1 or 2 decimal places when it is mathematically expedient for everyday applications.

millimeters (mm)inches (in)
1 mm0.04 in
2 mm0.08 in
3 mm0.12 in
4 mm0.16 in
5 mm0.20 in
6 mm0.24 in
7 mm0.28 in
8 mm0.31 in
9 mm0.35 in
10 mm0.39 in
11 mm0.43 in
12 mm0.47 in
13 mm0.51 in
14 mm0.55 in
15 mm0.59 in
16 mm0.63 in
17 mm0.67 in
18 mm0.71 in
19 mm0.75 in
20 mm0.79 in
21 mm0.83 in
22 mm0.87 in
23 mm0.91 in
24 mm0.94 in
25 mm0.98 in
26 mm1.02 in
27 mm1.06 in
28 mm1.10 in
29 mm1.14 in
30 mm1.18 in
31 mm1.22 in
32 mm1.26 in
33 mm1.30 in
34 mm1.34 in
35 mm1.38 in
36 mm1.42 in
37 mm1.46 in
38 mm1.50 in
39 mm1.54 in
40 mm1.57 in
41 mm1.61 in
42 mm1.65 in
43 mm1.69 in
44 mm1.73 in
45 mm1.77 in
46 mm1.81 in
47 mm1.85 in
48 mm1.89 in
49 mm1.93 in
50 mm1.97 in
51 mm2.01 in
52 mm2.05 in
53 mm2.09 in
54 mm2.13 in
55 mm2.17 in
56 mm2.20 in
57 mm2.24 in
58 mm2.28 in
59 mm2.32 in
60 mm2.36 in
61 mm2.40 in
62 mm2.44 in
63 mm2.48 in
64 mm2.52 in
65 mm2.56 in
66 mm2.60 in
67 mm2.64 in
68 mm2.68 in
69 mm2.72 in
70 mm2.76 in
71 mm2.80 in
72 mm2.83 in
73 mm2.87 in
74 mm2.91 in
75 mm2.95 in
76 mm2.99 in
77 mm3.03 in
78 mm3.07 in
79 mm3.11 in
80 mm3.15 in
81 mm3.19 in
82 mm3.23 in
83 mm3.27 in
84 mm3.31 in
85 mm3.35 in
86 mm3.39 in
87 mm3.43 in
88 mm3.46 in
89 mm3.50 in
90 mm3.54 in
91 mm3.58 in
92 mm3.62 in
93 mm3.66 in
94 mm3.70 in
95 mm3.74 in
96 mm3.78 in
97 mm3.82 in
98 mm3.86 in
99 mm3.90 in
100 mm3.94 in
millimeters (mm)inches (in)
101 mm3.98 in
102 mm4.02 in
103 mm4.06 in
104 mm4.09 in
105 mm4.13 in
106 mm4.17 in
107 mm4.21 in
108 mm4.25 in
109 mm4.29 in
110 mm4.33 in
111 mm4.37 in
112 mm4.41 in
113 mm4.45 in
114 mm4.49 in
115 mm4.53 in
116 mm4.57 in
117 mm4.61 in
118 mm4.65 in
119 mm4.69 in
120 mm4.72 in
121 mm4.76 in
122 mm4.80 in
123 mm4.84 in
124 mm4.88 in
125 mm4.92 in
126 mm4.96 in
127 mm5.00 in
128 mm5.04 in
129 mm5.08 in
130 mm5.12 in
131 mm5.16 in
132 mm5.20 in
133 mm5.24 in
134 mm5.28 in
135 mm5.31 in
136 mm5.35 in
137 mm5.39 in
138 mm5.43 in
139 mm5.47 in
140 mm5.51 in
141 mm5.55 in
142 mm5.59 in
143 mm5.63 in
144 mm5.67 in
145 mm5.71 in
146 mm5.75 in
147 mm5.79 in
148 mm5.83 in
149 mm5.87 in
150 mm5.91 in
151 mm5.94 in
152 mm5.98 in
153 mm6.02 in
154 mm6.06 in
155 mm6.10 in
156 mm6.14 in
157 mm6.18 in
158 mm6.22 in
159 mm6.26 in
160 mm6.30 in
161 mm6.34 in
162 mm6.38 in
163 mm6.42 in
164 mm6.46 in
165 mm6.50 in
166 mm6.54 in
167 mm6.57 in
168 mm6.61 in
169 mm6.65 in
170 mm6.69 in
171 mm6.73 in
172 mm6.77 in
173 mm6.81 in
174 mm6.85 in
175 mm6.89 in
176 mm6.93 in
177 mm6.97 in
178 mm7.01 in
179 mm7.05 in
180 mm7.09 in
181 mm7.13 in
182 mm7.17 in
183 mm7.20 in
184 mm7.24 in
185 mm7.28 in
186 mm7.32 in
187 mm7.36 in
188 mm7.40 in
189 mm7.44 in
190 mm7.48 in
191 mm7.52 in
192 mm7.56 in
193 mm7.60 in
194 mm7.64 in
195 mm7.68 in
196 mm7.72 in
197 mm7.76 in
198 mm7.80 in
199 mm7.83 in
200 mm7.87 in

Conversion of 1 millimeter (mm) to other units of length

Here is a reference list providing a conversion of 1 millimeter (mm) to its equivalent values in various units of length, both metric and imperial:

  • 1 millimeter (mm) = 1,000,000 nanometers (nm)
  • 1 millimeter (mm) = 1,000 micrometers (ยตm)
  • 1 millimeter (mm) = 0.1 centimeter (cm)
  • 1 millimeter (mm) = 0.01 decimeter (dm)
  • 1 millimeter (mm) = 0.001 meter (m)
  • 1 millimeter (mm) = 0.000001 kilometer (km)
  • 1 millimeter (mm) = 0.039370078740157 inch (in)
  • 1 millimeter (mm) = 0.0032808398950131 foot (ft)
  • 1 millimeter (mm) = 0.0010936132983377 yard (yd)
  • 1 millimeter (mm) = 0.00000062137119223733 mile (mi)
  • 1 millimeter (mm) = 0.00000053995680345572 nautical mile (nmi)

What is a millimeter (mm)?

Definition of millimeter: A millimeter is a unit of length in the International System of Units (SI). It is equivalent to one thousandth of a meter (10^-3 m). It is commonly used for precisely measuring small lengths and dimensions such as mechanical parts in engineering and manufacturing.

The abbreviation for millimeter is mm. The single Unicode character ใŽœ (U+339C) represents the 2-character Latin abbreviation for millimeter. The Windows Alt code for this character ใŽœ is Alt + 13212.

What is an inch (in)?

Definition of inch: An inch is an imperial and US customary unit of length equal to 1/12 of a foot or 2.54 centimeters. It is often used in the United States and the United Kingdom, that follow these measurement systems for small measurements such as in construction and carpentry.

The abbreviation for inch is in. The single Unicode character ใŒ (U+33CC) represents the 2-character Latin abbreviation for inch. The Windows Alt code for this character ใŒ is Alt + 13260.

The informal symbol for inch is represented by a double prime (โ€ณ) or double quote (โ€œ). For example, 12 inches can be written as 12โ€ณ.