Centimeters to Kilometers Converter

Centimeters to Kilometers

Convert centimeters (cm) to kilometers (km). Both measure distance and dimension, and the conversion comes up in construction, navigation, sports work.

The Formula

`` kilometers = centimeters × 0.00001 centimeters = kilometers × 100000 `

One centimeter is 1.0000e-5 kilometers, and one kilometer is 100,000 centimeters.

Conversion Table

Centimeters	Kilometers
1 cm	1.0000e-5 km
2 cm	2.0000e-5 km
5 cm	5.0000e-5 km
10 cm	1.0000e-4 km
25 cm	2.5000e-4 km
50 cm	5.0000e-4 km
100 cm	0.001 km
500 cm	0.005 km
1,000 cm	0.01 km

The Other Direction

Kilometers	Centimeters
1 km	100,000 cm
2 km	200,000 cm
5 km	500,000 cm
10 km	1,000,000 cm
25 km	2,500,000 cm
50 km	5,000,000 cm
100 km	10,000,000 cm
500 km	50,000,000 cm
1,000 km	100,000,000 cm

What Each Unit Is

Centimeters (cm) — one hundredth of a metre. A metric subdivision, and the everyday unit for body and object measurements in metric countries.

Kilometers (km) — 1,000 metres. The metric system’s road-scale unit, adopted across most of the world in the 19th century.

A Sense of Scale

• A fingernail is about 1 cm wide
• A credit card is 8.6 cm long
• A4 paper is 21 cm wide
• A 20-minute walk covers about 1.5 km
• A marathon is 42.195 km
• A cruising airliner flies at 11 km

Precision

The factor 0.00001 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

In Code

`javascript const centimeterToKilometer = (value) => value * 0.00001; ``

Where This Conversion Comes Up

• Construction
• Navigation
• Sports
• Sewing
• Mapping

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 cm with the factor truncated at each decimal place:

Decimals kept	Factor	137 cm becomes	Error
0	0	0	100.0000%
1	0	0	100.0000%
2	0	0	100.0000%
3	0	0	100.0000%
4	0	0	100.0000%

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured centimeters to three significant figures, the answer in kilometers is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Centimeters

The same value in every other unit this converter supports for length:

From	To	Unit
1 cm	0.01 m	Meters
1 cm	10 mm	Millimeters
1 cm	6.2137e-6 mi	Miles
1 cm	0.0109361 yd	Yards
1 cm	0.0328084 ft	Feet
1 cm	0.393701 in	Inches
1 cm	5.3996e-6 nmi	Nautical Miles

Chaining conversions works — centimeters to metres to feet gives the same answer as centimeters to feet — but each step rounds, so a chain of three conversions carries three roundings. Convert directly where a direct factor exists.