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Microns to MM Converter

Convert microns to millimeters in one step. Results update live in both directions, with a worked formula, nearby units and a 1–100 chart you can click.

MicronsFrom

µm

MillimetersTo

Decimal places

Step-by-step calculation

How to use the Microns to MM Converter

Type a value in the Microns 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.

Microns to millimeters formula

mm = µm ÷ 1000

Take the value in microns.
Divide it by 1000 (the number of microns in one millimeter).

Example: 50 µm ÷ 1000 = 0.05 mm.

Reverse formula (millimeters to microns): µm = mm × 1000. Example: 0.075 mm × 1000 = 75 µm.

The factor is a whole number (1000), so this one is easy to do in your head or with long division.

µm to mm conversion table (1–100)

Click any row to load it into the converter.

Microns to millimeters

Microns	Millimeters
1 µm	0.001 mm
2 µm	0.002 mm
3 µm	0.003 mm
4 µm	0.004 mm
5 µm	0.005 mm
6 µm	0.006 mm
7 µm	0.007 mm
8 µm	0.008 mm
9 µm	0.009 mm
10 µm	0.01 mm
11 µm	0.011 mm
12 µm	0.012 mm
13 µm	0.013 mm
14 µm	0.014 mm
15 µm	0.015 mm
16 µm	0.016 mm
17 µm	0.017 mm
18 µm	0.018 mm
19 µm	0.019 mm
20 µm	0.02 mm
21 µm	0.021 mm
22 µm	0.022 mm
23 µm	0.023 mm
24 µm	0.024 mm
25 µm	0.025 mm
26 µm	0.026 mm
27 µm	0.027 mm
28 µm	0.028 mm
29 µm	0.029 mm
30 µm	0.03 mm
31 µm	0.031 mm
32 µm	0.032 mm
33 µm	0.033 mm
34 µm	0.034 mm
35 µm	0.035 mm
36 µm	0.036 mm
37 µm	0.037 mm
38 µm	0.038 mm
39 µm	0.039 mm
40 µm	0.04 mm
41 µm	0.041 mm
42 µm	0.042 mm
43 µm	0.043 mm
44 µm	0.044 mm
45 µm	0.045 mm
46 µm	0.046 mm
47 µm	0.047 mm
48 µm	0.048 mm
49 µm	0.049 mm
50 µm	0.05 mm
51 µm	0.051 mm
52 µm	0.052 mm
53 µm	0.053 mm
54 µm	0.054 mm
55 µm	0.055 mm
56 µm	0.056 mm
57 µm	0.057 mm
58 µm	0.058 mm
59 µm	0.059 mm
60 µm	0.06 mm
61 µm	0.061 mm
62 µm	0.062 mm
63 µm	0.063 mm
64 µm	0.064 mm
65 µm	0.065 mm
66 µm	0.066 mm
67 µm	0.067 mm
68 µm	0.068 mm
69 µm	0.069 mm
70 µm	0.07 mm
71 µm	0.071 mm
72 µm	0.072 mm
73 µm	0.073 mm
74 µm	0.074 mm
75 µm	0.075 mm
76 µm	0.076 mm
77 µm	0.077 mm
78 µm	0.078 mm
79 µm	0.079 mm
80 µm	0.08 mm
81 µm	0.081 mm
82 µm	0.082 mm
83 µm	0.083 mm
84 µm	0.084 mm
85 µm	0.085 mm
86 µm	0.086 mm
87 µm	0.087 mm
88 µm	0.088 mm
89 µm	0.089 mm
90 µm	0.09 mm
91 µm	0.091 mm
92 µm	0.092 mm
93 µm	0.093 mm
94 µm	0.094 mm
95 µm	0.095 mm
96 µm	0.096 mm
97 µm	0.097 mm
98 µm	0.098 mm
99 µm	0.099 mm
100 µm	0.1 mm

Millimeters to microns

Millimeters	Microns
1 mm	1,000 µm
2 mm	2,000 µm
3 mm	3,000 µm
4 mm	4,000 µm
5 mm	5,000 µm
6 mm	6,000 µm
7 mm	7,000 µm
8 mm	8,000 µm
9 mm	9,000 µm
10 mm	10,000 µm
11 mm	11,000 µm
12 mm	12,000 µm
13 mm	13,000 µm
14 mm	14,000 µm
15 mm	15,000 µm
16 mm	16,000 µm
17 mm	17,000 µm
18 mm	18,000 µm
19 mm	19,000 µm
20 mm	20,000 µm
21 mm	21,000 µm
22 mm	22,000 µm
23 mm	23,000 µm
24 mm	24,000 µm
25 mm	25,000 µm
26 mm	26,000 µm
27 mm	27,000 µm
28 mm	28,000 µm
29 mm	29,000 µm
30 mm	30,000 µm
31 mm	31,000 µm
32 mm	32,000 µm
33 mm	33,000 µm
34 mm	34,000 µm
35 mm	35,000 µm
36 mm	36,000 µm
37 mm	37,000 µm
38 mm	38,000 µm
39 mm	39,000 µm
40 mm	40,000 µm
41 mm	41,000 µm
42 mm	42,000 µm
43 mm	43,000 µm
44 mm	44,000 µm
45 mm	45,000 µm
46 mm	46,000 µm
47 mm	47,000 µm
48 mm	48,000 µm
49 mm	49,000 µm
50 mm	50,000 µm
51 mm	51,000 µm
52 mm	52,000 µm
53 mm	53,000 µm
54 mm	54,000 µm
55 mm	55,000 µm
56 mm	56,000 µm
57 mm	57,000 µm
58 mm	58,000 µm
59 mm	59,000 µm
60 mm	60,000 µm
61 mm	61,000 µm
62 mm	62,000 µm
63 mm	63,000 µm
64 mm	64,000 µm
65 mm	65,000 µm
66 mm	66,000 µm
67 mm	67,000 µm
68 mm	68,000 µm
69 mm	69,000 µm
70 mm	70,000 µm
71 mm	71,000 µm
72 mm	72,000 µm
73 mm	73,000 µm
74 mm	74,000 µm
75 mm	75,000 µm
76 mm	76,000 µm
77 mm	77,000 µm
78 mm	78,000 µm
79 mm	79,000 µm
80 mm	80,000 µm
81 mm	81,000 µm
82 mm	82,000 µm
83 mm	83,000 µm
84 mm	84,000 µm
85 mm	85,000 µm
86 mm	86,000 µm
87 mm	87,000 µm
88 mm	88,000 µm
89 mm	89,000 µm
90 mm	90,000 µm
91 mm	91,000 µm
92 mm	92,000 µm
93 mm	93,000 µm
94 mm	94,000 µm
95 mm	95,000 µm
96 mm	96,000 µm
97 mm	97,000 µm
98 mm	98,000 µm
99 mm	99,000 µm
100 mm	100,000 µm

Common values

Microns	Millimeters	Example
1 µm	0.001 mm	1 µm
2.5 µm	0.0025 mm	PM2.5 particle
5 µm	0.01 mm	5 µm
10 µm	0.01 mm	PM10 particle
25 µm	0.03 mm	25 µm
50 µm	0.05 mm	Human hair (thin)
75 µm	0.07 mm	Human hair (average)
100 µm	0.1 mm	100 µm
500 µm	0.5 mm	Half a millimeter
1,000 µm	1 mm	1 mm

About microns and millimeters

Microns (µm). The micron (micrometer, µm) is one millionth of a meter or one thousandth of a millimeter. Fibres, filters, dust particles and paint coatings are measured in microns.

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

What is 1 micron in millimeters?

One micron equals 0.001 millimeters. Looking at it the other way, one millimeter is 1,000 microns.

How do you convert microns to millimeters?

Divide the number of microns by 1000. For example, 50 µm ÷ 1000 = 0.05 mm.

What is 75 microns in millimeters?

75 µm is 0.075 mm (human hair (average)).

How much is 500 microns in millimeters?

500 microns equals 0.5 millimeters.

How do I convert millimeters back to microns?

Multiply by 1000, or press the ⇄ swap button above. For example, 0.075 mm × 1000 = 75 µm.

Is a micron the same as a micrometer?

Yes. Micron is the traditional name for the micrometer (µm), one millionth of a meter. 1,000 microns make one millimeter.

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