Other way around. There are 1000 milligrams in one gram. And 1000 grams in a kilogram. So there are 1,000,000 milligrams in one kilogram. Or you could say that 1 milligram is 1/1000000th (one millionth) of a kilogram.

There are 1000 milligrams in a gram. There are 10 decigrams in a gram. Therefore there are 100 milligrams in a decigram, or there are 0.01 decigrams in a milligram.

1 kilogram = 1 000 000 milligrams. A milligram is one thousandth of a gram. A kilogram is one thousands grams. 1000 X 1000 = 1,000,000 So, a kilogram = 1,000.000 milligrams or one million milligrams.