in2 to mm2 Converter - Square Inch to Square Millimeter

Conversion derivation

Express both in2 and mm2 in the same base unit m2 (square meter), then cancel the shared base unit.

1. 1

   Rewrite in2 in the base unit

   $$1in2=0.00064516m2$$
2. 2

   Rewrite mm2 in the base unit

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

   Forward conversion

   $$\begin{array}{rl}1in2& =\frac{0.00064516\cancel{m2}}{0.000001\cancel{m2}}\times 1mm2\\ & =\frac{0.00064516}{0.000001}mm2\\ & =645.16mm2\end{array}$$
4. 4

   Reverse conversion

   $$\begin{array}{rl}1mm2& =\frac{0.000001\cancel{m2}}{0.00064516\cancel{m2}}\times 1in2\\ & =\frac{0.000001}{0.00064516}in2\\ & =0.0015500031in2\end{array}$$