Centimetres to Kilometres Converter
Convert centimetres to kilometres — divide by 100,000, a five-place jump across the metric scale. Results update as you type; exact factors shown.
One centimetre is 0 kilometres — see the exact factor, not a rounded rule of thumb.
How the centimetres to kilometres converter works
Every length is converted through the metre, the SI base unit of length. The inch has been defined as exactly 25.4 mm since the 1959 international yard and pound agreement, so a foot is exactly 0.3048 m, a yard 0.9144 m and a statute mile 1,609.344 m. The nautical mile is 1,852 m by international definition.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common length conversions
| From | To | Units |
|---|---|---|
| 1,000 cm | 0.01 km | centimetres to kilometres |
| 5,000 cm | 0.05 km | centimetres to kilometres |
| 10,000 cm | 0.1 km | centimetres to kilometres |
| 25,000 cm | 0.25 km | centimetres to kilometres |
| 50,000 cm | 0.5 km | centimetres to kilometres |
| 100,000 cm | 1 km | centimetres to kilometres |
| 250,000 cm | 2.5 km | centimetres to kilometres |
| 500,000 cm | 5 km | centimetres to kilometres |
| 1,000,000 cm | 10 km | centimetres to kilometres |
| 2,000,000 cm | 20 km | centimetres to kilometres |
| 5,000,000 cm | 50 km | centimetres to kilometres |
| 10,000,000 cm | 100 km | centimetres to kilometres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metres |
|---|---|---|
| millimetre | mm | 0.001 metre |
| centimetre | cm | 0.01 metre |
| metre | m | 1 metre |
| kilometre | km | 1,000 metre |
| inch | in | 0.0254 metre |
| foot | ft | 0.3048 metre |
| yard | yd | 0.9144 metre |
| mile | mi | 1,609.344 metre |
| nautical mile | nmi | 1,852 metre |
FAQFrequently asked questions about length conversion
How many centimetres in a kilometre?
100,000 — a hundred centimetres to the metre, a thousand metres to the kilometre.
How do I convert cm to km?
Divide by 100,000, or move the decimal point five places left.
What is 100,000 cm in km?
Exactly 1 km.
When would I need this?
Mostly in map scaling and in physics problems that mix scales — everyday distances rarely span both units.
What is 250,000 cm in km?
2.5 km.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.