ft vers km convertisseur - Pied vers Kilomètre

Conversion derivation

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

1. 1

   Rewrite ft in the base unit

   $$1\mathrm{ft}=0.3048\mathrm{m}$$
2. 2

   Rewrite km in the base unit

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

   Forward conversion

   $$\begin{array}{rl}1\mathrm{ft}& =\frac{0.3048\cancel{\mathrm{m}}}{1,000\cancel{\mathrm{m}}}\times 1\mathrm{km}\\ & =\frac{0.3048}{1,000}\mathrm{km}\\ & =0.0003048\mathrm{km}\end{array}$$
4. 4

   Reverse conversion

   $$\begin{array}{rl}1\mathrm{km}& =\frac{1,000\cancel{\mathrm{m}}}{0.3048\cancel{\mathrm{m}}}\times 1\mathrm{ft}\\ & =\frac{1,000}{0.3048}\mathrm{ft}\\ & =3,280.83989501\mathrm{ft}\end{array}$$