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SMOG Index Calculator

Estimate the years of education needed to understand your text.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator finds the SMOG readability grade (Simple Measure of Gobbledygook) of English text: grade = 1.0430 × √(polysyllabic word count × (30 / sentence count)) + 3.1291, using words of three or more syllables as the main signal of reading difficulty. The result is expressed as a US school grade level, i.e. the years of education needed to fully understand the text on first read.

Healthcare communicators, educators, and technical writers use SMOG — recommended by health-literacy guidelines for patient materials — to check that instructions, consent forms, and public information are written at an accessible reading level. Paste your text to get its SMOG grade.

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