How to convert 997 millimeters to feet?
We know (by definition) that:
We can set up a proportion to solve for the number of feet.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 foot is equal to 0.305717151454363 times 997 millimeters.
It can also be expressed as: 997 millimeters is equal to feet.
An approximate numerical result would be: nine hundred and ninety-seven millimeters is about three point two seven feet, or alternatively, a foot is about zero point three one times nine hundred and ninety-seven millimeters.
 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.