Kilometers to Centimeters Converter

Kilometers to Centimeters

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

The Formula

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

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

Conversion Table

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

The Other Direction

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

What Each Unit Is

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

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

A Sense of Scale

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

Precision

The factor 100000 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 kilometerToCentimeter = (value) => value * 100000; ``

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 km with the factor truncated at each decimal place:

Decimals kept	Factor	137 km becomes	Error
0	100000	13,700,000	—
1	100000	13,700,000	—
2	100000	13,700,000	—
3	100000	13,700,000	—
4	100000	13,700,000	—

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 kilometers to three significant figures, the answer in centimeters is only good to three — writing more digits claims precision the measurement never had.

Other Conversions From Kilometers

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

From	To	Unit
1 km	1,000 m	Meters
1 km	1,000,000 mm	Millimeters
1 km	0.621371 mi	Miles
1 km	1,093.61 yd	Yards
1 km	3,280.84 ft	Feet
1 km	39,370.08 in	Inches
1 km	0.539957 nmi	Nautical Miles

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