Question: 300 mg is how much?
Answer: How to convert milligrams to grams? 1 Milligram (mg) is equal to 0.001 gram (g). To convert milligrams to grams, multiply the milligram value by 0.001 or divide by 1000. For example, to find out how many grams is 300 milligrams, divide 300 by 1000, that makes 0.3 gram is equal to 300 mg.