There are 1000 micrometers in a millimeter (1000 µm in 1 mm). To find out how many micrometers in "x" millimeters, multiply the millimeter value by 1000.
1 Millimeter = 1 000 Micrometers
Millimeter (millimetre) is a metric unit and equal to one thousandth of a meter. The abbreviation is "mm".
Micrometer (micrometre) is a metric unit and used for precise measurement of small distances in engineering and machining. The abbreviation is "µm".