Convert Kilometer to Centimeter
Convert kilometers to centimeters instantly. 1 kilometer = 100000 centimeter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centimeter to Kilometer converter for the reverse conversion.
Units explained
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
Centimeter
A centimeter is a metric unit of length equal to one hundredth of a meter (1/100 m). It is one of the most commonly used SI sub-units in daily life, especially for measuring small objects, body dimensions, paper sizes, and short distances.
The centimeter emerged from the French metric system established by the French Academy of Sciences in 1793. The metric system introduced decimal-based prefixes (milli-, centi-, deci-, deca-, hecto-, kilo-) to create proportional sub-units of the meter.
Centimeters are the standard unit for everyday measurement in nearly every country outside the United States. They are used for body height, clothing sizes, rainfall, paper formats (A4 is 21 × 29.7 cm), screen dimensions, and most consumer product specifications.
Developed in France during the late 18th century as part of the metric system designed by the French Academy of Sciences. Formally adopted in France in 1795 and ratified internationally through the Metre Convention signed in Paris in 1875.
Kilometer to Centimeter conversion formula
The relationship between kilometers and centimeters:
To convert kilometers to centimeters, multiply the value in kilometers by 100000. To reverse, multiply centimeters by 1e-5.
How to use this converter
Type a value into the calculator. The result in centimeters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Centimeter to Kilometer converter for the reverse direction.
Step-by-step: convert kilometers to centimeters
- Write down the value in kilometers (km).
- Multiply that value by the factor 100000.
- The product is the equivalent value in centimeters (cm).
- To reverse, multiply the centimeter value by 1e-5.
Worked examples
Example 1 — Convert 1 km to cm:
1 × 100000 = 100000 cm
Example 2 — Convert 100 km to cm:
100 × 100000 = 1e+7 cm
Real-world example — Half-kilometer in centimeters
500 m (0.5 km) equals 50,000 cm. Cartographers building map-scale ratios convert km to cm constantly because the printed map sheet's dimensions are in cm but the territory it represents is in km.
0.5 km × 100000 = 50000 cm
Real-world example — Two-kilometer distance scale
2 km equals 200,000 cm. The conversion is used in physics and engineering education to demonstrate the five-order-of-magnitude scale difference between everyday-distance units in the metric system.
2 km × 100000 = 200000 cm
Real-world example — One-kilometer to centimeters
1 km equals 100,000 cm. The conversion comes up in physics-class unit-analysis exercises and in cartography, where a map's scale ratio is computed by expressing both the map distance (in cm) and the real-world distance (in km) in compatible units.
1 km × 100000 = 100000 cm
Kilometer to Centimeter conversion table
Standard reference values for converting kilometers to centimeters:
| Kilometer [km] | Centimeter [cm] |
|---|---|
| 0.01 | 1000 |
| 0.1 | 10000 |
| 1 | 100000 |
| 2 | 200000 |
| 3 | 300000 |
| 4 | 400000 |
| 5 | 500000 |
| 10 | 1000000 |
| 20 | 2000000 |
| 30 | 3000000 |
| 40 | 4000000 |
| 50 | 5000000 |
| 100 | 1e+7 |
| 500 | 5e+7 |
| 1000 | 1e+8 |
Frequently asked questions
How many centimeters is 1 kilometer?
How do I convert kilometers to centimeters?
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How many centimeters is 100 kilometers?
Popular length unit conversions
Convert Kilometer to other length units
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Metric / SI (17 units)
Imperial / US Customary (27 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 km = 100000 cm) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.