

Convert Kilometers to Millimeters (km to mm) ▶ Conversion Table
How to convert1 millimeter (mm) = 0.000001 kilometer (km). Millimeter (mm) is a unit of Length used in Metric system. Kilometer (km) is a unit of Length used in Metric system. Millimeter: A Unit of LengthDefinition of the millimeterA millimeter is a unit of length in the metric system, which is based on the International System of Units (SI). It is defined as one thousandth of a meter, which is the SI base unit of length. One millimeter can be written as 1 mm or 0.001 m. How to convert millimeter to other units of lengthTo convert millimeter to other units of length, we need to use conversion factors that relate the millimeter to the desired unit. For example, to convert millimeter to centimeter, we need to know that 1 cm = 10 mm, so we can divide the number of millimeters by 10 to get the number of centimeters. Similarly, to convert millimeter to inch, we need to know that 1 in = 25.4 mm, so we can divide the number of millimeters by 25.4 to get the number of inches. Here are some common conversion factors for millimeter and other units of length in the US standard system and the SI system:
Where millimeter is usedThe millimeter is a widely used unit of length in many fields and applications around the world. Some examples are:
History of millimeterThe millimeter has a long and varied history in different countries and cultures. Some historical facts are:
Example conversions of millimeter to other unitsHere are some examples of how to convert millimeter to other units of length using the conversion factors given above:
Kilometer  Unit of Distance / LengthUnit Symbol/Abbreviation: km Where the unit used in the World: The kilometer is used as a unit used to measure distances or lengths. Definition of the Unit: The kilometer (kilometre in UK spelling) is a unit of length/distance in the metric system (SI Unit system) equivalent to one thousand meters. 1 km is equivalent to 0.62137 miles. History of the Unit: Although the meter was defined in 1799 in France, the kilometer was first adopted for everyday use by the Dutch in 1817 under local name of the mijl. The myriametre (10000 meters) and "lieues de Poste" (Postal leagues, 4288 meters) were preferred to the "kilometer" for everyday use in France in 19th century. In the mid 19th century the kilometer was already in everyday use in the Italy and in Netherlands and the myriametre was still in use in France. The CIPM (The International Committee for Weights and Measures) officially abolished the prefix "myria" and the "myriametre" in 1935, leaving the kilometer as the recognised unit of length instead of myriametre. Where it's used: The kilometer is commonly used on road signs to indicate the distance to travel to a given location, on maps to indicate scale, for odometer indication in automotive industry. It is also the most popular unit for describing the distance between geographical points and locations. Equivalents in other units and scales:
1 km is equivalent to 0.621371 mi. Español Russian Français 
Millimeters to Centimeters Millimeters to Decimeters Millimeters to Feet Millimeters to Inches Millimeters to Meters Millimeters to Micrometers Millimeters to Yards Kilometers to Feet Kilometers to Meters Kilometers to Miles Kilometers to Yards Centimeters to Inches Feet to Inches Feet to Kilometers Feet to Meters Feet to Yards Inches to Centimeters Inches to Feet Inches to Meters Inches to Millimeters Kilometers to Miles Meters to Feet Meters to Inches Meters to Yards Miles to Kilometers Millimeters to Inches Yards to Feet Yards to Inches Yards to Meters 
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