To convert grams to milligrams, you need to know that 1 gram is equal to 1000 milligrams. Therefore, to find out how many milligrams are in 3.5 grams, you perform the following calculation:
3.5 g x 1000 mg/g = 3500 mg
So, there are 3500 milligrams in 3.5 grams. It’s a simple conversion, just remember that moving from grams to milligrams, you multiply by 1000.