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.
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One gallon of plain water weighs about 8.35 pounds which converts to 3,787,000 milligrams.
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.
Approx 1620 milligrams.
150 milligrams