To convert millimeters (mm) to cubic millimeters (mm³), you need to cube the length in millimeters.
1 millimeter = 1 mm
So, to convert 13 millimeters to cubic millimeters:
\[ 13 \text{ mm} \times 13 \text{ mm} \times 13 \text{ mm} = 13^3 \text{ mm}^3 = 2197 \text{ mm}^3 \]
Therefore, 13 millimeters is equal to 2197 cubic millimeters.