Centimeters to Kilometers
Convert centimeters to kilometers instantly — one centimeter is 1e-05 kilometers.
| Centimeters | Kilometers |
|---|---|
| 1 cm | 1e-05 km |
| 2 cm | 2e-05 km |
| 3 cm | 3e-05 km |
| 5 cm | 5e-05 km |
| 10 cm | 0.0001 km |
| 25 cm | 0.00025 km |
| 50 cm | 0.0005 km |
| 100 cm | 0.001 km |
How to use
- Enter a value in the Centimeters field.
- The Kilometers figure appears immediately — no button to press.
- Typing in the Kilometers field converts back to Centimeters the same way.
- Use the reference table for the values that come up most often.
Centimeters to Kilometers formula
Converting centimeters to kilometers is a single multiplication by 1e-05.
km = cm × 1e-05
Read in reverse, one kilometer is exactly 100,000 centimeters.
Why this factor: the centimeter and the kilometer are both defined against the meter, so dividing one definition by the other gives 1e-05 directly. Both definitions are set out in full below.
To go the other way, divide by 1e-05 — or use the Kilometers to Centimeters converter, which is the same calculation reversed.
Worked example
Given 100 cm, multiplying by 1e-05 yields 0.001 km.
100 cm × 1e-05 = 0.001 km
The converter above does this for any value you type, in either direction.
What is a centimeter?
A centimeter is one hundredth of a meter, the everyday metric unit for body and object measurements.
Definition: Exactly 0.01 meter by SI prefix definition.
Where it is used: Height, clothing sizes, rainfall, paper and screen dimensions across the metric world.
What is a kilometer?
A kilometer is 1,000 meters, the standard unit for road distances and geography in most of the world.
Definition: Exactly 1,000 meters by SI prefix definition — 'kilo' means 10³.
Where it is used: Road signs, running and cycling distances, and map scales outside the US and UK.
Centimeters vs Kilometers
The centimeter and the kilometer belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many kilometers are in a centimeter?
One centimeter equals 1e-05 kilometers.
What is the formula to convert centimeters to kilometers?
Multiply the number of centimeters by 1e-05. To reverse it, divide by 1e-05 instead.
How do I convert kilometers back to centimeters?
Divide by 1e-05, which is the same as multiplying by 100000.
How many kilometers are in 10 centimeters?
10 cm works out to 0.0001 km.
How is the centimeter defined?
Exactly 0.01 meter by SI prefix definition.