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# 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: ].

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Definitions:

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 18.72 millimeters?

As;

1 millimeters = 1.0E-6 kilometers

18.72 millimeters = Y kilometers

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

Y equals 18.72 times 1.0E-6 over 1

(i.e.) Y = 18.72 * 1.0E-6 / 1 = 1.872E-5 kilometers

Answer is: 1.872E-5 kilometers are equivalent to 18.72 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 ) 17.07 mm

( ii ) 23.8 mm

( iii ) 60.5 mm

References
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