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Flesch Reading Ease Score Calculator

Score your text live with six classic readability formulas: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI.

Processed entirely in your browser — nothing you enter here is ever uploaded.

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Avg. words per sentence
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Avg. letters per word
Flesch Reading Ease —
206.835 − 1.015 × (words/sentence) − 84.6 × (syllables/word)
Flesch-Kincaid Grade —
0.39 × (words/sentence) + 11.8 × (syllables/word) − 15.59
Gunning Fog Index —
0.4 × (words/sentence + 100 × complex words/words)
SMOG Index —
1.043 × √(polysyllables × 30/sentences) + 3.1291
Coleman-Liau Index —
0.0588 × L − 0.296 × S − 15.8 (L letters, S sentences per 100 words)
Automated Readability Index —
4.71 × (characters/word) + 0.5 × (words/sentence) − 21.43

Longest sentences

    These formulas are calibrated for English; for other languages the scores are only indicative. Nothing is uploaded — the text is analyzed in your browser.

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    Result

    About this tool

    This page opens the readability checker with the Flesch Reading Ease card highlighted — paste your text and the score updates live as you edit.

    Flesch Reading Ease runs from 0 to 100, and higher means easier: 206.835 − 1.015 × (words per sentence) − 84.6 × (syllables per word). Around 60-70 is plain English for a general audience; below 30 reads like an academic paper.

    The scale was calibrated on English text and syllables are estimated with a heuristic, so scores for other languages are indicative. The full tool adds Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI — everything computed privately in your browser.

    Example. The cat sat on the mat. is counted as 6 words and 1 sentence, and Flesch Reading Ease is clamped to 100 because the raw score sits above the scale.

    Limit. Syllables are vowel groups plus a silent-e rule, so the six English formulas are not recalibrated for other languages.

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    Category overview

    Accepted Formats & Rules

    • Live Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau and ARI scores with the formula shown on each card.
    • Average sentence length, average word length and a list of your three longest, hardest sentences.
    • Heuristic syllable counting (vowel groups with silent-e handling) — no dictionary download, everything stays offline.