How to convert 18 months to weeks?
We know (by definition) that:
We can set up a proportion to solve for the number of weeks.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 week is equal to 0.0127769099031868 times 18 months.
It can also be expressed as: 18 months is equal to weeks.
An approximate numerical result would be: eighteen months is about seventy-eight point two six weeks, or alternatively, a week is about zero point zero one times eighteen months.
 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.