The SMOG formula takes into consideration (1) the total number of sentences, and (2) the number of words of three or more syllables.
Since SMOG readability formula aims for 100% comprehension, its grade level scores are usually higher than any of the other formulas, most of which target between 50% and 75% comprehension.
Of the readability formulas included in the Readability Calculations package - the formula nearest to SMOG in terms of its comprehension target is the FOG formula, which targets 90% comprehension.
Both
Readability Calculations and
Readability PLUS display this formulas scoring results on a screen which
may contain other formula results as well.