SMOG : Measure Gobbledygook. By G.
Harry McLaughlin My readability formula SMOG estimates the years of education needed to understand a piece of writing. SMOG is widely used, particularly for checking health messages. A 2010 study in the Journal of The Royal College of Physicians of Edinburgh calls SMOG the gold standard and concludes that it should be the preferred measure of webpage readability. Tests Document Readability. Readability index calculator Result.