Micrometers to Millimeters Converter

How to convert micrometers to millimeters

millimeters = micrometers ÷ 1,000

1 micrometer is one millionth of a meter (SI prefix micro, 10⁻⁶). 1 millimeter is one thousandth of a meter (SI prefix milli, 10⁻³).

The factor is exact in both directions: 1 µm = 0.001 mm and 1 mm = 1,000 µm. Nothing is rounded until you choose how many decimals to show.

Worked example: 75 µm

1. Start with the value in micrometers: 75 µm.
2. Divide by 1,000, because 1 millimeter = 1,000 micrometers: 75 ÷ 1,000 = 0.075 mm.

Micrometers to millimeters chart

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Micrometers from 10 to 1,000 converted to millimeters with the exact factor, shown to five significant digits.

Micrometers to millimeters, part 1 of 4

µm	mm
10	0.01
20	0.02
30	0.03
40	0.04
50	0.05
60	0.06
70	0.07
80	0.08
90	0.09
100	0.1
110	0.11
120	0.12
130	0.13
140	0.14
150	0.15
160	0.16
170	0.17
180	0.18
190	0.19
200	0.2
210	0.21
220	0.22
230	0.23
240	0.24
250	0.25

Micrometers to millimeters, part 2 of 4

µm	mm
260	0.26
270	0.27
280	0.28
290	0.29
300	0.3
310	0.31
320	0.32
330	0.33
340	0.34
350	0.35
360	0.36
370	0.37
380	0.38
390	0.39
400	0.4
410	0.41
420	0.42
430	0.43
440	0.44
450	0.45
460	0.46
470	0.47
480	0.48
490	0.49
500	0.5

Micrometers to millimeters, part 3 of 4

µm	mm
510	0.51
520	0.52
530	0.53
540	0.54
550	0.55
560	0.56
570	0.57
580	0.58
590	0.59
600	0.6
610	0.61
620	0.62
630	0.63
640	0.64
650	0.65
660	0.66
670	0.67
680	0.68
690	0.69
700	0.7
710	0.71
720	0.72
730	0.73
740	0.74
750	0.75

Micrometers to millimeters, part 4 of 4

µm	mm
760	0.76
770	0.77
780	0.78
790	0.79
800	0.8
810	0.81
820	0.82
830	0.83
840	0.84
850	0.85
860	0.86
870	0.87
880	0.88
890	0.89
900	0.9
910	0.91
920	0.92
930	0.93
940	0.94
950	0.95
960	0.96
970	0.97
980	0.98
990	0.99
1,000	1

millimeters = micrometers ÷ 1,000. Factors: BIPM SI Brochure. unitcheck.net/length/micrometers-to-millimeters/