SMOG Readability Calculator
Calculate the SMOG grade from polysyllabic word counts.
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What is the SMOG readability score?
The SMOG readability score estimates the years of education needed to understand a text, based on how many words of three or more syllables it uses. It is widely trusted for health and safety materials. Snabbit calculates the SMOG grade live in your browser, so the text you grade is never sent anywhere.
How to use the SMOG Readability
- 1 Paste a paragraph or more into the input box.
- 2 The SMOG report calculates instantly.
- 3 Read the SMOG grade and polysyllable count.
- 4 Replace long words and re-check to lower it.
What you can use it for
- Grading patient leaflets and health information.
- Checking safety instructions are widely readable.
- Comparing readability methods on the same text.
- Meeting plain-language requirements for the public.
Frequently asked questions
What makes a word polysyllabic?
In SMOG, any word with three or more syllables counts as polysyllabic. The more of these a passage uses, the higher the grade.
How is the SMOG grade calculated?
It uses the formula 1.043 times the square root of polysyllable count times 30 divided by sentences, plus 3.1291. The result is a school-grade estimate.
How does SMOG differ from Flesch-Kincaid?
SMOG focuses purely on polysyllabic words, while Flesch-Kincaid blends sentence length with syllables per word. SMOG is popular for healthcare content. Both run privately here.
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