Mil (Thou) to Micrometer Conversion Chart

This chart converts Mil (Thou) (mil) to Micrometer (μm) using the factor 25.4. One mil equals 25.4 μm; one μm equals 0.039370079 mil.

μm = mil × 25.4

mil	μm
1	25.4
2	50.8
3	76.2
4	101.6
5	127
6	152.4
7	177.8
8	203.2
9	228.6
10	254
11	279.4
12	304.8
13	330.2
14	355.6
15	381
16	406.4
17	431.8
18	457.2
19	482.6
20	508
21	533.4
22	558.8
23	584.2
24	609.6
25	635
26	660.4
27	685.8
28	711.2
29	736.6
30	762
31	787.4
32	812.8
33	838.2
34	863.6
35	889
36	914.4
37	939.8
38	965.2
39	990.6
40	1,016
41	1,041.4
42	1,066.8
43	1,092.2
44	1,117.6
45	1,143
46	1,168.4
47	1,193.8
48	1,219.2
49	1,244.6
50	1,270

mil	μm
51	1,295.4
52	1,320.8
53	1,346.2
54	1,371.6
55	1,397
56	1,422.4
57	1,447.8
58	1,473.2
59	1,498.6
60	1,524
61	1,549.4
62	1,574.8
63	1,600.2
64	1,625.6
65	1,651
66	1,676.4
67	1,701.8
68	1,727.2
69	1,752.6
70	1,778
71	1,803.4
72	1,828.8
73	1,854.2
74	1,879.6
75	1,905
76	1,930.4
77	1,955.8
78	1,981.2
79	2,006.6
80	2,032
81	2,057.4
82	2,082.8
83	2,108.2
84	2,133.6
85	2,159
86	2,184.4
87	2,209.8
88	2,235.2
89	2,260.6
90	2,286
91	2,311.4
92	2,336.8
93	2,362.2
94	2,387.6
95	2,413
96	2,438.4
97	2,463.8
98	2,489.2
99	2,514.6
100	2,540

How to use this chart

Find the mil value in the left column and read its μm equivalent on the right. Every row uses the same conversion factor, so the printable table is suitable for quick reference without recalculating each value.

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