The APPROXIMATE length of the snake is the shed minus 4". As far as I know, this is the rule with any snake, since the basic amount of stretch tends to be 4" no matter what. Of course, this is only an estimated length since an exact length would only be obtained when the snake was no longer moving...such as in death. Sad, but true.

And you're welcome, Starmom. I pass on what I have learned.