* Typical Pencil Length: An unsharpened pencil is usually around 17-19 cm long. Let's use 18 cm for our example.

* Conversion: There are 100,000 centimeters (cm) in 1 kilometer (km).

* Calculation: 18 cm / 100,000 cm/km = 0.00018 km

Therefore, an unsharpened pencil is approximately 0.00018 kilometers long.