A milligram is a 1000th of a gram which relates to weight
a millilitre is a 1000th of a litre which relates to volume
so technically they are talking about different things.
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A milligram is one-thousandth of a gram. A milligram is smaller than a gram.
Milliliters are smaller than cups.
milligram
milligram
1mcg (microgram) is 1,000 times smaller than 1mg (milligram).