SMOG Readability Index Formula

Equation for calculate smog readability index is,

Using the SMOG Formula:

Count 10 consecutive sentences near the beginning, middle, and end of your material (30 total sentences).
1. Count every word with three or more syllables in the 30 sentences, even if the same word appears more than once.
2. Add the total number of words counted. Use the SMOG Conversion Table to find the grade level.
3. If your material has fewer than 30 sentences, follow the instructions for "SMOG on Shorter Passages" and use SMOG Conversion Table II.