Kilometers to Centimeters Converter

The kilometer is exactly 1,000 meters, the unit of length in the International System used for distances between places rather than across a room. It is written km and is the basis of the metric road network.

Road signs, speed limits, odometers and race distances use kilometers in most of the world. Maps quote distances in kilometers, and athletic events such as the marathon are described in kilometers.

One kilometer equals 0.621371 miles, an exact conversion from the definition of the mile as 1,609.344 meters. The displayed figure is rounded, so converting kilometers to miles and back may shift the last digit.

Mixing meters and kilometers is the usual error: a walking route given as 4,000 meters is four kilometers, not forty. A kilometer is also a length unit, so square kilometers measure area.

Kilometers and miles both measure road distance, while meters measure shorter spans inside the same journey. Treating a mile figure as kilometers understates the distance by about a third, and mixing the two within one route confuses every later step.

The centimeter is exactly one hundredth of a meter, written 0.01 m, and it is the unit most metric rulers and tape measures are marked in, with ten millimeters to one centimeter.

It appears on clothing labels, school rulers, rainfall reports and body measurements, and in medicine for wound sizes. A person's height is commonly recorded in centimeters on metric forms.

The factor between centimeters and inches is exact: one inch equals 2.54 centimeters. Results on this site are shown with up to six decimal places, so a value converted out and back can end one digit away.

The usual error is reading a millimeter figure as centimeters, which overstates a length tenfold, or treating square centimeters as if they scaled with centimeters rather than with their square.

Centimeters, millimeters and meters divide the same scale: millimeters suit engineering tolerances, centimeters suit height and clothing, and meters suit rooms and buildings. Choosing the wrong unit misplaces the decimal point by ten or a hundred, so the label matters as much as the figure.