Convert Millimeter to Kilometer (mm to km)

In next fields, kindly type your value in the text box under title [ From: ] to convert from millimeter to kilometer (mm to km). As you type your value, the answer will be automatically calculated and displayed in the text box under title [ To: ].


Millimeter (abbreviation: mm): is a unit of length in the SI metric system, equal to one thousandth of a metre. Therefore, there are thousand millimetres in a metre and ten millimetres in a centimetre.

Kilometer (abbreviation: km): is a unit of length in the SI metric system, equal to one thousand metres (kilo- being the prefix for 1000). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world countries.

How to Convert Millimeters to Kilometers

Example: How many kilometers are equivalent to 64.92 millimeters?


1 millimeters = 1.0E-6 kilometers

64.92 millimeters = Y kilometers

Assuming Y is the answer, and by criss-cross principle;

Y equals 64.92 times 1.0E-6 over 1

(i.e.) Y = 64.92 * 1.0E-6 / 1 = 6.492E-5 kilometers

Answer is: 6.492E-5 kilometers are equivalent to 64.92 millimeters.

Practice Question: Convert the following units into km:

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 98.08 mm

( ii ) 17.82 mm

( iii ) 84.63 mm

  • Wikipedia
  • USMA
  • NIST

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