One gallon of plain water weighs about 8.35 pounds which converts to 3,787,000 milligrams.
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Assuming mg is milligrams (the standard abbreviation) the answer is none. A milligram is a measure of mass. A gallon is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid. If you are not convinced, consider a gallon of air. How many milligrams? Next consider a gallon of molten lead. How many milligrams?
Well, sweetie, a gallon is a unit of volume, not weight. So, it's like asking how many apples are in a football field. It just doesn't make sense. So, to convert gallons to milligrams, you'd need to know the density of the substance you're working with.
Only if you have pure water in mind, then: 0.9 milliliters of pure water weigh 0.9 grams or 900 milligrams.
This is another question asking us to compare units of different quantities. Milligram is a unit of mass (or weight), and gallon is a unit of capacity (volume). There is no answer. You might as well ask how many ounces are in an inch.
1 gallon = 16 cups 1 cup =0.23 gallon