A gram, because a milligram is one thousandth of a gram.
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A gram (g) is bigger than a milligram (mg). Specifically, 1 gram equals 1,000 milligrams.
g signifies grams and mg signifies milligrams. Grams are bigger, since the prefix "milli" means a thousandth (1/1000). A thousand milligrams are the same as one gram.