To convert milligrams (mg) to grams (g), you can use the conversion factor that 1 gram is equal to 1000 milligrams.
To convert 0.675 mg to grams:
\[
0.675 \, \text{mg} \times \frac{1 \, \text{g}}{1000 \, \text{mg}} = 0.000675 \, \text{g}
\]
So, 0.675 mg is equal to 0.000675 grams.