Micrometers to millimeters

millimeters = micrometers × 0.001

How to convert micrometers to millimeters

One micrometer is 0.001 millimeters, so multiply the number of micrometers by 0.001. For example, 20 micrometers is 20 × 0.001 = 0.02 millimeters. To go back, divide by the same number, or multiply by 1,000.

Quick estimate

Multiplying by about 0.001 gets within 0.0% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Length conversions come up in DIY and building plans, running and cycling distances, maps, clothing sizes and travel between countries that use metric and imperial units.

micrometers	millimeters
1 um	0.001 mm
2 um	0.002 mm
3 um	0.003 mm
4 um	0.004 mm
5 um	0.005 mm
6 um	0.006 mm
7 um	0.007 mm
8 um	0.008 mm
9 um	0.009 mm
10 um	0.01 mm
11 um	0.011 mm
12 um	0.012 mm
13 um	0.013 mm
14 um	0.014 mm
15 um	0.015 mm
16 um	0.016 mm
17 um	0.017 mm
18 um	0.018 mm
19 um	0.019 mm
20 um	0.02 mm
25 um	0.025 mm
30 um	0.03 mm
40 um	0.04 mm
50 um	0.05 mm
60 um	0.06 mm
70 um	0.07 mm
75 um	0.075 mm
80 um	0.08 mm
90 um	0.09 mm
100 um	0.1 mm
120 um	0.12 mm
150 um	0.15 mm
200 um	0.2 mm
250 um	0.25 mm
300 um	0.3 mm
400 um	0.4 mm
500 um	0.5 mm
750 um	0.75 mm
1,000 um	1 mm
1,500 um	1.5 mm
2,000 um	2 mm
5,000 um	5 mm
10,000 um	10 mm

Questions

How many millimeters are in a micrometer?

0.001 millimeters.

How do I convert micrometers to millimeters in a spreadsheet?

Put the value in A1 and type =A1*0.001, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.