km2 to mm2 Converter - Square Kilometer to Square Millimeter

Conversion derivation

Express both km2 and mm2 in the same base unit m2 (square meter), then cancel the shared base unit.

1. 1

   Rewrite km2 in the base unit

   $$1km2=1,000,000m2$$
2. 2

   Rewrite mm2 in the base unit

   $$1mm2=0.000001m2$$
3. 3

   Forward conversion

   $$\begin{array}{rl}1km2& =\frac{1,000,000\cancel{m2}}{0.000001\cancel{m2}}\times 1mm2\\ & =\frac{1,000,000}{0.000001}mm2\\ & =1\times 10^{12}mm2\end{array}$$
4. 4

   Reverse conversion

   $$\begin{array}{rl}1mm2& =\frac{0.000001\cancel{m2}}{1,000,000\cancel{m2}}\times 1km2\\ & =\frac{0.000001}{1,000,000}km2\\ & =1\times 10^{-12}km2\end{array}$$