inch to km Converter - Inch to Kilometer

Conversion derivation

Express both inch and km in the same base unit m (meter), then cancel the shared base unit.

1. 1

   Rewrite inch in the base unit

   $$1\mathrm{inch}=0.0254\mathrm{m}$$
2. 2

   Rewrite km in the base unit

   $$1\mathrm{km}=1,000\mathrm{m}$$
3. 3

   Forward conversion

   $$\begin{array}{rl}1\mathrm{inch}& =\frac{0.0254\cancel{\mathrm{m}}}{1,000\cancel{\mathrm{m}}}\times 1\mathrm{km}\\ & =\frac{0.0254}{1,000}\mathrm{km}\\ & =0.0000254\mathrm{km}\end{array}$$
4. 4

   Reverse conversion

   $$\begin{array}{rl}1\mathrm{km}& =\frac{1,000\cancel{\mathrm{m}}}{0.0254\cancel{\mathrm{m}}}\times 1\mathrm{inch}\\ & =\frac{1,000}{0.0254}\mathrm{inch}\\ & =39,370.0787402\mathrm{inch}\end{array}$$