Readability Index (RI); average sentence length (ASL) + % long words.
Target technical tender submissions 30-35; FT 41, Sun <20.
ASL = {no of words} ÷ {no of sentences}; e.g. 650 ÷ 20 = 32
%LW = {no of words 3 syllables or more} ÷ {no of words}*100; e.g. 108 ÷ 650 x 100 = 17
RI = ASL + %LW; e.g. 32 + 17 = 49
NB Strictly the Gunning Fox Index is then calculated by multiplying this by 0.4 which is meant to indicate how many years of formal education needs to read this with ease. On line tool available.
