[NTG-context] Count the words per line

I am setting with grid-set, and I am wondering, if there is a possibility to count the number of words in the lines (not for each single line, but in average over all lines). That would be helpful to get a perfectly readably book (words per row is one of these readability-measures). That tool could ignore hyphenated words at the end of a line, or count it with 0.5, or whatever. Thanks Huseyin