Grade Level Checker Online
Check the US grade level required to read your text.
What is Grade Level Checker?
Estimates the US school grade level required to read and understand your text using three formulas: Flesch-Kincaid Grade Level, Gunning Fog Index, and Coleman-Liau Index. Shows grade level, corresponding school year, and interpretation.
Common Use Cases
Educational content calibration, making government documents more accessible, grading student writing, checking age-appropriateness of children's books, and content strategy.
How It Works
Applies three established readability formulas to your text and shows the grade level for each, along with an average. All calculations run in your browser.
Frequently Asked Questions
What is Gunning Fog Index?
Gunning Fog = 0.4 × (ASL + percentage of complex words). Complex words have 3+ syllables.
What is Coleman-Liau Index?
CLI = 0.0588 × L − 0.296 × S − 15.8, where L is average letters per 100 words and S is average sentences per 100 words.
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