4 milimeters equals 4,000 micrometers.
Convert 4 milimeters into meters, kilometers, decimeters, centimeters, nanometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...
Convert 4001 micrometers into meters, kilometers, decimeters, centimeters, nanometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...