Millimeters to Inches Conversion Table — With Fractional Equivalents

Hardware and engineering reference — 1 to 300 mm

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What is Millimeter (mm)?

Metric unit equal to one thousandth (1/1000) of a meter.

What is Inch (in)?

Imperial/US customary unit standardized as exactly 25.4 millimeters since 1959.

How to Convert Millimeter to Inch

inches = mm ÷ 25.4 (exact). Fractions shown to nearest 1/64".

Example

Convert 31 mm to in:

31 × 0.0393701 = 1.22047 in

Millimeters to Inches Conversion Table — With Fractional Equivalents

Values from 1 to 300 mm.

mm to in (1 – 75 mm)
mm in Nearest Fraction cm
1 0.0393701 3/64" 0.1
2 0.0787402 5/64" 0.2
3 0.11811 1/8" 0.3
4 0.15748 5/32" 0.4
5 0.19685 13/64" 0.5
6 0.23622 15/64" 0.6
7 0.275591 9/32" 0.7
8 0.314961 5/16" 0.8
9 0.354331 23/64" 0.9
10 0.393701 25/64" 1.0
11 0.433071 7/16" 1.1
12 0.472441 15/32" 1.2
13 0.511811 33/64" 1.3
14 0.551181 35/64" 1.4
15 0.590551 19/32" 1.5
16 0.629921 5/8" 1.6
17 0.669291 43/64" 1.7
18 0.708661 45/64" 1.8
19 0.748031 3/4" 1.9
20 0.787402 25/32" 2.0
21 0.826772 53/64" 2.1
22 0.866142 55/64" 2.2
23 0.905512 29/32" 2.3
24 0.944882 15/16" 2.4
25 0.984252 63/64" 2.5
26 1.02362 1 1/32" 2.6
27 1.06299 1 1/16" 2.7
28 1.10236 1 7/64" 2.8
29 1.14173 1 9/64" 2.9
30 1.1811 1 3/16" 3.0
31 1.22047 1 7/32" 3.1
32 1.25984 1 17/64" 3.2
33 1.29921 1 19/64" 3.3
34 1.33858 1 11/32" 3.4
35 1.37795 1 3/8" 3.5
36 1.41732 1 27/64" 3.6
37 1.45669 1 29/64" 3.7
38 1.49606 1 1/2" 3.8
39 1.53543 1 17/32" 3.9
40 1.5748 1 37/64" 4.0
41 1.61417 1 39/64" 4.1
42 1.65354 1 21/32" 4.2
43 1.69291 1 11/16" 4.3
44 1.73228 1 47/64" 4.4
45 1.77165 1 49/64" 4.5
46 1.81102 1 13/16" 4.6
47 1.85039 1 27/32" 4.7
48 1.88976 1 57/64" 4.8
49 1.92913 1 59/64" 4.9
50 1.9685 1 31/32" 5.0
51 2.00787 2 1/64" 5.1
52 2.04724 2 3/64" 5.2
53 2.08661 2 3/32" 5.3
54 2.12598 2 1/8" 5.4
55 2.16535 2 11/64" 5.5
56 2.20472 2 13/64" 5.6
57 2.24409 2 1/4" 5.7
58 2.28346 2 9/32" 5.8
59 2.32283 2 21/64" 5.9
60 2.3622 2 23/64" 6.0
61 2.40157 2 13/32" 6.1
62 2.44094 2 7/16" 6.2
63 2.48031 2 31/64" 6.3
64 2.51969 2 33/64" 6.4
65 2.55906 2 9/16" 6.5
66 2.59843 2 19/32" 6.6
67 2.6378 2 41/64" 6.7
68 2.67717 2 43/64" 6.8
69 2.71654 2 23/32" 6.9
70 2.75591 2 3/4" 7.0
71 2.79528 2 51/64" 7.1
72 2.83465 2 53/64" 7.2
73 2.87402 2 7/8" 7.3
74 2.91339 2 29/32" 7.4
75 2.95276 2 61/64" 7.5
mm to in (76 – 150 mm)
mm in Nearest Fraction cm
76 2.99213 2 63/64" 7.6
77 3.0315 3 1/32" 7.7
78 3.07087 3 5/64" 7.8
79 3.11024 3 7/64" 7.9
80 3.14961 3 5/32" 8.0
81 3.18898 3 3/16" 8.1
82 3.22835 3 15/64" 8.2
83 3.26772 3 17/64" 8.3
84 3.30709 3 5/16" 8.4
85 3.34646 3 11/32" 8.5
86 3.38583 3 25/64" 8.6
87 3.4252 3 27/64" 8.7
88 3.46457 3 15/32" 8.8
89 3.50394 3 1/2" 8.9
90 3.54331 3 35/64" 9.0
91 3.58268 3 37/64" 9.1
92 3.62205 3 5/8" 9.2
93 3.66142 3 21/32" 9.3
94 3.70079 3 45/64" 9.4
95 3.74016 3 47/64" 9.5
96 3.77953 3 25/32" 9.6
97 3.8189 3 13/16" 9.7
98 3.85827 3 55/64" 9.8
99 3.89764 3 57/64" 9.9
100 3.93701 3 15/16" 10.0
101 3.97638 3 31/32" 10.1
102 4.01575 4 1/64" 10.2
103 4.05512 4 1/16" 10.3
104 4.09449 4 3/32" 10.4
105 4.13386 4 9/64" 10.5
106 4.17323 4 11/64" 10.6
107 4.2126 4 7/32" 10.7
108 4.25197 4 1/4" 10.8
109 4.29134 4 19/64" 10.9
110 4.33071 4 21/64" 11.0
111 4.37008 4 3/8" 11.1
112 4.40945 4 13/32" 11.2
113 4.44882 4 29/64" 11.3
114 4.48819 4 31/64" 11.4
115 4.52756 4 17/32" 11.5
116 4.56693 4 9/16" 11.6
117 4.6063 4 39/64" 11.7
118 4.64567 4 41/64" 11.8
119 4.68504 4 11/16" 11.9
120 4.72441 4 23/32" 12.0
121 4.76378 4 49/64" 12.1
122 4.80315 4 51/64" 12.2
123 4.84252 4 27/32" 12.3
124 4.88189 4 7/8" 12.4
125 4.92126 4 59/64" 12.5
126 4.96063 4 61/64" 12.6
127 5 5" 12.7
128 5.03937 5 3/64" 12.8
129 5.07874 5 5/64" 12.9
130 5.11811 5 1/8" 13.0
131 5.15748 5 5/32" 13.1
132 5.19685 5 13/64" 13.2
133 5.23622 5 15/64" 13.3
134 5.27559 5 9/32" 13.4
135 5.31496 5 5/16" 13.5
136 5.35433 5 23/64" 13.6
137 5.3937 5 25/64" 13.7
138 5.43307 5 7/16" 13.8
139 5.47244 5 15/32" 13.9
140 5.51181 5 33/64" 14.0
141 5.55118 5 35/64" 14.1
142 5.59055 5 19/32" 14.2
143 5.62992 5 5/8" 14.3
144 5.66929 5 43/64" 14.4
145 5.70866 5 45/64" 14.5
146 5.74803 5 3/4" 14.6
147 5.7874 5 25/32" 14.7
148 5.82677 5 53/64" 14.8
149 5.86614 5 55/64" 14.9
150 5.90551 5 29/32" 15.0
mm to in (151 – 225 mm)
mm in Nearest Fraction cm
151 5.94488 5 15/16" 15.1
152 5.98425 5 63/64" 15.2
153 6.02362 6 1/32" 15.3
154 6.06299 6 1/16" 15.4
155 6.10236 6 7/64" 15.5
156 6.14173 6 9/64" 15.6
157 6.1811 6 3/16" 15.7
158 6.22047 6 7/32" 15.8
159 6.25984 6 17/64" 15.9
160 6.29921 6 19/64" 16.0
161 6.33858 6 11/32" 16.1
162 6.37795 6 3/8" 16.2
163 6.41732 6 27/64" 16.3
164 6.45669 6 29/64" 16.4
165 6.49606 6 1/2" 16.5
166 6.53543 6 17/32" 16.6
167 6.5748 6 37/64" 16.7
168 6.61417 6 39/64" 16.8
169 6.65354 6 21/32" 16.9
170 6.69291 6 11/16" 17.0
171 6.73228 6 47/64" 17.1
172 6.77165 6 49/64" 17.2
173 6.81102 6 13/16" 17.3
174 6.85039 6 27/32" 17.4
175 6.88976 6 57/64" 17.5
176 6.92913 6 59/64" 17.6
177 6.9685 6 31/32" 17.7
178 7.00787 7 1/64" 17.8
179 7.04724 7 3/64" 17.9
180 7.08661 7 3/32" 18.0
181 7.12598 7 1/8" 18.1
182 7.16535 7 11/64" 18.2
183 7.20472 7 13/64" 18.3
184 7.24409 7 1/4" 18.4
185 7.28346 7 9/32" 18.5
186 7.32283 7 21/64" 18.6
187 7.3622 7 23/64" 18.7
188 7.40157 7 13/32" 18.8
189 7.44094 7 7/16" 18.9
190 7.48031 7 31/64" 19.0
191 7.51969 7 33/64" 19.1
192 7.55906 7 9/16" 19.2
193 7.59843 7 19/32" 19.3
194 7.6378 7 41/64" 19.4
195 7.67717 7 43/64" 19.5
196 7.71654 7 23/32" 19.6
197 7.75591 7 3/4" 19.7
198 7.79528 7 51/64" 19.8
199 7.83465 7 53/64" 19.9
200 7.87402 7 7/8" 20.0
201 7.91339 7 29/32" 20.1
202 7.95276 7 61/64" 20.2
203 7.99213 7 63/64" 20.3
204 8.0315 8 1/32" 20.4
205 8.07087 8 5/64" 20.5
206 8.11024 8 7/64" 20.6
207 8.14961 8 5/32" 20.7
208 8.18898 8 3/16" 20.8
209 8.22835 8 15/64" 20.9
210 8.26772 8 17/64" 21.0
211 8.30709 8 5/16" 21.1
212 8.34646 8 11/32" 21.2
213 8.38583 8 25/64" 21.3
214 8.4252 8 27/64" 21.4
215 8.46457 8 15/32" 21.5
216 8.50394 8 1/2" 21.6
217 8.54331 8 35/64" 21.7
218 8.58268 8 37/64" 21.8
219 8.62205 8 5/8" 21.9
220 8.66142 8 21/32" 22.0
221 8.70079 8 45/64" 22.1
222 8.74016 8 47/64" 22.2
223 8.77953 8 25/32" 22.3
224 8.8189 8 13/16" 22.4
225 8.85827 8 55/64" 22.5
mm to in (226 – 300 mm)
mm in Nearest Fraction cm
226 8.89764 8 57/64" 22.6
227 8.93701 8 15/16" 22.7
228 8.97638 8 31/32" 22.8
229 9.01575 9 1/64" 22.9
230 9.05512 9 1/16" 23.0
231 9.09449 9 3/32" 23.1
232 9.13386 9 9/64" 23.2
233 9.17323 9 11/64" 23.3
234 9.2126 9 7/32" 23.4
235 9.25197 9 1/4" 23.5
236 9.29134 9 19/64" 23.6
237 9.33071 9 21/64" 23.7
238 9.37008 9 3/8" 23.8
239 9.40945 9 13/32" 23.9
240 9.44882 9 29/64" 24.0
241 9.48819 9 31/64" 24.1
242 9.52756 9 17/32" 24.2
243 9.56693 9 9/16" 24.3
244 9.6063 9 39/64" 24.4
245 9.64567 9 41/64" 24.5
246 9.68504 9 11/16" 24.6
247 9.72441 9 23/32" 24.7
248 9.76378 9 49/64" 24.8
249 9.80315 9 51/64" 24.9
250 9.84252 9 27/32" 25.0
251 9.88189 9 7/8" 25.1
252 9.92126 9 59/64" 25.2
253 9.96063 9 61/64" 25.3
254 10 10" 25.4
255 10.0394 10 3/64" 25.5
256 10.0787 10 5/64" 25.6
257 10.1181 10 1/8" 25.7
258 10.1575 10 5/32" 25.8
259 10.1969 10 13/64" 25.9
260 10.2362 10 15/64" 26.0
261 10.2756 10 9/32" 26.1
262 10.315 10 5/16" 26.2
263 10.3543 10 23/64" 26.3
264 10.3937 10 25/64" 26.4
265 10.4331 10 7/16" 26.5
266 10.4724 10 15/32" 26.6
267 10.5118 10 33/64" 26.7
268 10.5512 10 35/64" 26.8
269 10.5906 10 19/32" 26.9
270 10.6299 10 5/8" 27.0
271 10.6693 10 43/64" 27.1
272 10.7087 10 45/64" 27.2
273 10.748 10 3/4" 27.3
274 10.7874 10 25/32" 27.4
275 10.8268 10 53/64" 27.5
276 10.8661 10 55/64" 27.6
277 10.9055 10 29/32" 27.7
278 10.9449 10 15/16" 27.8
279 10.9843 10 63/64" 27.9
280 11.0236 11 1/32" 28.0
281 11.063 11 1/16" 28.1
282 11.1024 11 7/64" 28.2
283 11.1417 11 9/64" 28.3
284 11.1811 11 3/16" 28.4
285 11.2205 11 7/32" 28.5
286 11.2598 11 17/64" 28.6
287 11.2992 11 19/64" 28.7
288 11.3386 11 11/32" 28.8
289 11.378 11 3/8" 28.9
290 11.4173 11 27/64" 29.0
291 11.4567 11 29/64" 29.1
292 11.4961 11 1/2" 29.2
293 11.5354 11 17/32" 29.3
294 11.5748 11 37/64" 29.4
295 11.6142 11 39/64" 29.5
296 11.6535 11 21/32" 29.6
297 11.6929 11 11/16" 29.7
298 11.7323 11 47/64" 29.8
299 11.7717 11 49/64" 29.9
300 11.811 11 13/16" 30.0

Practical Examples: mm to in Conversions

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Frequently Asked Questions

How do I convert mm to inches?

Divide mm by 25.4. Example: 10 mm ÷ 25.4 = 0.3937" ≈ 25/64".

What is 3 mm in fractional inches?

3 mm = 0.1181" ≈ 1/8" (3.175 mm). Difference: 0.175 mm.

How precise are the fractions?

Fractions rounded to 1/64" precision. For tighter tolerances, use the decimal inch value.

Related Conversion Tables

mm to Inches (standard)

1-100 mm

Inches to mm

1-100 in

Inches to mm (with fractions)

1-50 in
Conversion factors verified against NIST, BIPM, ISO 80000-3 1 inch = 2.54 cm by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes