A milligram (mg) is one one-thousandth of a gram. That is, it takes 1000 milligrams to equal one gram. So, 500 milligrams is one-half gram.
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500 mg = 0.5 g
18 grams = 18,000 mg 18,000 / 500 = 36 pills
1000 milligrams = 1 gram so 500*1000 mg = 500*1000/1000 grams = 500 grams.
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1g=1000mg When converting units, put what kind of units you want (grams) on top, and what kind of units you have (mg) on bottom. so.. 500mg x (1g) = 0.5 grams 1000mg mg will cancel leaving your units in grams.