Centimeter is 0.01 meter units.
Centimeters to Kilometers Converter — cm to km
Convert Centimeter (cm) to Kilometer (km) using the exact conversion factor (1 centimeter = 0.00001 kilometer). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Centimeters to Kilometers converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Kilometer is 1000 meter units.
Result = input x 0.01 / 1000.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Centimeters to Kilometers
Centimeter and Kilometer both measure length. Centimeter is typically associated with standard small-length unit worldwide except the US, while Kilometer is typically associated with standard road, distance, and mapping unit in nearly every country except the United States.
Formula
kilometers = centimeters × 0.00001
This factor comes from each unit's defined relationship to the category's base unit: 1 centimeter equals 0.01 base units, and 1 kilometer equals 1000 base units, so dividing one by the other gives the direct centimeter-to-kilometer factor of 0.00001.
Simple example
1 cm × 0.00001 = 0.00001 km
1 centimeter = 0.00001 kilometers.
Real-world example
10 cm × 0.00001 = 0.0001 km
10 centimeters = 0.0001 kilometers.
Conversion table
| Centimeter (cm) | Kilometer (km) |
|---|---|
| 1 cm | 0.00001 km |
| 5 cm | 0.00005 km |
| 10 cm | 0.0001 km |
| 21.0975 cm | 0.000210975 km |
| 42.195 cm | 0.00042195 km |
| 100 cm | 0.001 km |
Reverse conversion: Kilometer to Centimeter
0.00001 km × 100000 = 1 cm
0.00001 kilometers = 1 centimeter.
centimeters = kilometers × 100000
For a page dedicated to this direction, see Kilometer to Centimeter.
Centimeter vs. Kilometer
| Aspect | Centimeter | Kilometer |
|---|---|---|
| Family | SI derived (metric prefix) unit | SI derived (metric prefix) unit |
| Typical use | Everyday small-object and body measurement (height, clothing sizes) outside the US | Road signage, speed limits, and vehicle odometers outside the US |
| Where it's used | Standard small-length unit worldwide except the US | Standard road, distance, and mapping unit in nearly every country except the United States |
Understanding the Centimeter
Centimeter (cm) measures distance. A centimeter is one-hundredth of a meter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small-length unit worldwide except the US
Uses of the Centimeter today
- Everyday small-object and body measurement (height, clothing sizes) outside the US
- Construction and manufacturing tolerances internationally
History of the Centimeter
The centimeter follows directly from the meter via the 'centi-' SI prefix (10⁻²), introduced with the metric system in the 1790s.
Historical origin. Centimeter was not the invention of a single named person; it developed through the process described above.
Understanding the Kilometer
Kilometer (km) measures distance. A kilometer is 1,000 meters — the meter is the SI base unit of length. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard road, distance, and mapping unit in nearly every country except the United States
Uses of the Kilometer today
- Road signage, speed limits, and vehicle odometers outside the US
- Geographic and mapping distances
- Endurance sports (marathons are measured in kilometers internationally, though the marathon distance itself is a fixed value in both systems)
History of the Kilometer
The meter was defined during the French Revolutionary metric reforms as one ten-millionth of the distance from the North Pole to the Equator along a meridian through Paris. 'Kilo-' is simply the SI prefix for 1,000, making the kilometer a direct decimal multiple.
The meter itself has been redefined several times as measurement precision improved — from a physical platinum-iridium bar (1889) to a krypton-86 wavelength (1960) to its current definition (1983) as the distance light travels in a fixed fraction of a second.
Historical origin. Kilometer was not the invention of a single named person; it developed through the process described above.
Centimeter — sources
- BIPM SI Brochure — SI prefixes — Defines 'centi-' as the prefix for 10⁻².
Kilometer — sources
- BIPM — The metre (SI base unit) — Current definition and history of the meter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilometers are in 1 centimeter?
1 centimeter equals 0.00001 kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert centimeter to kilometer?
Multiply the centimeter value by 0.00001. The converter above does this instantly to whatever precision you set.
How do I convert kilometer back to centimeter?
Use the reverse factor: 1 kilometer equals 100,000 centimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a centimeter?
Centimeter (cm) measures distance. A centimeter is one-hundredth of a meter. It is classified as a SI derived (metric prefix) unit.
What is a kilometer?
Kilometer (km) measures distance. A kilometer is 1,000 meters — the meter is the SI base unit of length. It is classified as a SI derived (metric prefix) unit.
Is the centimeter to kilometer conversion exact?
Yes. Both centimeter and kilometer are defined by fixed standards rather than physical artifacts, so the factor of 0.00001 used above is exact to as many digits as you choose to display.
Where is the centimeter still used today?
Standard small-length unit worldwide except the US