How to convert 18 inches to kilometers?
We know (by definition) that:
We can set up a proportion to solve for the number of kilometers.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 kilometer is equal to 2187.22659667542 times 18 inches.
It can also be expressed as: 18 inches is equal to kilometers.
An approximate numerical result would be: eighteen inches is about zero kilometers, or alternatively, a kilometer is about two thousand, one hundred and eighty-seven point two three times eighteen inches.
 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.