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“Nano” means one-billionth. Therefore, a nanogram is a billionth of a gram. … Therefore a milligram is a thousandth of a gram. One milligram is equal to one million nanograms. Is PG bigger than ng? ng↔mg 1 mg = 1000000 ng. ng↔ug 1 ug = 1000 ng. ng↔pg 1 ngRead More →