Since 1,000 milligrams is one gram.
One third of a gram is 333 milligrams.
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1 mg is 1/1000th of a gram; 750 mg is .75 (or 3/4) of a gram.
1000 mg per gram
There are 1000 mg in one gram.
A miligram is 1/1000 of a gram. 3 milligrams is 3/1000 of a gram, or 0.003 grams.
There are 1000 mg in a gram so 0.003 grams is equal to 3 mg.