Readability Score Calculator
Paste your text and get its Flesch Reading Ease and Flesch-Kincaid Grade Level scores — instantly, in your browser.
✓ Free · No account neededWhy readability affects AI citations
Answer engines prefer passages they can quote cleanly. Short sentences and plain words survive being lifted out of context; a sixty-word sentence full of subclauses does not. Readability scores are a rough proxy for that quality.
Paste your text below for a Flesch Reading Ease score and a Flesch-Kincaid grade level, updated as you type. Aim for the level your audience reads at, not the most impressive number.
Paste text above to see its readability scores.
How we calculate this
Flesch Reading Ease = 206.835 − 1.015×(words÷sentences) − 84.6×(syllables÷words). Higher is easier to read (0–100 scale).
Flesch-Kincaid Grade Level = 0.39×(words÷sentences) + 11.8×(syllables÷words) − 15.59. The result approximates the U.S. school grade needed to understand the text on first reading.
Syllables are estimated with a standard vowel-group heuristic (counting groups of consecutive vowels per word, adjusting for silent trailing “e” and common exceptions) — this is an approximation, not a dictionary lookup, so scores can be off by a fraction on unusual words.
Readability formulas measure sentence and word length, not accuracy, tone or usefulness. Use this as one signal among several, not a pass/fail test.