To convert milligrams to grams, you divide the number of milligrams by 1,000, since there are 1,000 milligrams in a gram.
So, for 63,000 milligrams:
\[ 63,000 , \text{mg} \div 1,000 = 63 , \text{grams} \]
Therefore, 63,000 milligrams is equal to 63 grams.