1 gram is in the metric system. do you mean 1ounce?
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The milligram is part of the SI system of measurements, it represents 1/1000 of a gram. One gram is the weight of one milliliter of pure water at 4 C. So the answer is no. The metric system is international, not US.
In the metric system prefix milli means 1/1000 (thousedndth) of something - in this case grams, thus there are 1000 milligrams in a gram
30 grams is equivalent to approximately 1.06 ounces in the metric system.
Milli-; 0.001 metre = 1 millimetre. 0.001 gram = 1 milligram. 0.001 second = 1 millisecond.