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1mg equals about 0.015gr
1g = 1000mg, 1mg = 1/1000 = 0.001g 0.9mg = 0.0009g
0.001
One milligram (1mg) is one thousandth of a gram, and one kilogram is one thousand grams. Therefore, there are 1000x1000mg in 1kg. There are 1000000mg in 1kg, so there are 4000000mg in 4kg.
50mg is bigger than 1mg