# How many grams are in 18.03 mg?

$18.03 \times {10}^{-} 3 g$
The $\text{m}$ in $\text{mg}$ specifies ${10}^{-} 3$. And thus $18.03 \text{ mg}$ $=$ $18.03 \times {10}^{-} 3 g$ $=$ $0.01803 \cdot g$.