How to Convert Microns to Millimeters Converting microns (micrometers) to millimeters is simple due to metric prefixes. Micron is 1/1000 of a millimeter. The Mathematical Formula To convert microns to millimeters, divide the number of microns by 1,000: Millimeters = Microns ÷ 1,000 Microns to Millimeters Conversion Table Microns (µm) Millimeters (mm) 1 µm0.001 mm 10 µm0.01 mm 100 µm0.1 mm 500 µm0.5 mm 1000 µm1 mm
