640 meters in kilometers

Conversion

640 meters is equivalent to 0.64 kilometers.^[1]

Conversion formula
How to convert 640 meters to kilometers?

We know (by definition) that: $1 m = 0.001 km$

We can set up a proportion to solve for the number of kilometers.

\frac{1 m}{640 m} = \frac{0.001 km}{x km}

Now, we cross multiply to solve for our unknown $x$ :

x km = \frac{640 m}{1 m} * 0.001 km \to x km = 0.64 km

Conclusion: $640 m = 0.64 km$

640 meters is equivalent to 0.64 kilometers

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 1.5625 times 640 meters.

It can also be expressed as: 640 meters is equal to $\frac{1}{1.5625}$ kilometers.

Approximation

An approximate numerical result would be: six hundred and forty meters is about zero kilometers, or alternatively, a kilometer is about one point five six times six hundred and forty meters.

Units involved

This is how the units in this conversion are defined:

Meters

"The metre (international spelling) or meter (American spelling), (from the Greek noun μέτρον, \"measure\") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299792458 seconds."

Wikipedia page of meters

Kilometers

The kilometre or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo being the SI prefix for 1000). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.

Wikipedia page of kilometers

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.

Conversion

Conversion formula How to convert 640 meters to kilometers?

Conversion in the opposite direction

Approximation

Conversion formula
How to convert 640 meters to kilometers?