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Flesch-Kincaid Grade Level Calculator

Calculate the Flesch-Kincaid grade level and reading ease of text.

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What is the Flesch-Kincaid grade level?

The Flesch-Kincaid grade level estimates the US school grade needed to understand a passage, from sentence length and syllables per word. A score of 8 means an eighth-grader could read it. Snabbit computes the grade and the companion reading-ease score live in your browser, so your text stays completely private.

How to use the Flesch-Kincaid Grade Level

  1. 1 Paste a paragraph or more into the input box.
  2. 2 The readability report calculates instantly.
  3. 3 Read the grade level and reading-ease score.
  4. 4 Simplify sentences and re-check to lower the grade.

What you can use it for

  • Making web content readable for a wide audience.
  • Meeting a target reading level for documentation.
  • Simplifying legal or medical text for the public.
  • Checking that lesson material suits a grade.

Frequently asked questions

What does the grade number mean?
It maps to a US school grade. A grade of 7 means a typical seventh-grader could understand the text. Lower numbers mean easier, more accessible writing.
How is the score calculated?
It uses the standard formula: 0.39 times average words per sentence, plus 11.8 times average syllables per word, minus 15.59. Syllables are estimated with a vowel-group heuristic.
How can I lower the grade level?
Use shorter sentences and simpler, fewer-syllable words. Re-run the check after editing. All processing happens in your browser, so your draft is never uploaded.

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