There is no such measure as a macrogram, although there is a microgram.
Having said that, a microgram is a measure of mass. A millimetre is a measure of length or distance. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid.
The question is like asking about the mass of your walk to school.
One millimeter is 0.000001km
There are 1,000 micrometers in one millimeter.
1 kilometer = 1000000 millimeter
1 micrometer = .001 millimeter 1000 micrometers in one millimeter (mm) = 10^-3 (um) = 10^-6
1 millimeter=0.001 meters
Macrogram is not a standard unit of measure.
Precisely and unequivocally, 1.
1 millimeter=0.0393700787 inches
.00001 (or 1 x 10-5) hectometers are in 1 millimeter
1 meter = 1000 millimeters 1 millimeter = 0.001 meter
1 millimeter=0.1 centimeter
1 decimeter = 100 millimeters. 1 Millimeter = 0.01 decimeters
1 meter = 1000 millimeters 1 millimeter = 0.001 meter
1 meter = 1000 millimeter
1 meter = 1000 millimeters 1 millimeter = 0.001 meter
1
1 millimeter (mm) = 0,1 centimeters (cm)