Readability Calculator

Paste English prose to estimate readability, sentence length, and syllable density locally in the browser.

English text

—Words

—Estimated syllables

—Sentences

—Syllables / word

—English syllables are estimated heuristically, so unusual names, abbreviations, and loanwords can differ from dictionary pronunciation.

Readability Calculator: Sentence Difficulty & Scores

Add Flesch-Kincaid grade, longest-sentence and sentence-difficulty evidence to the existing readability analysis.

Quick-win evidence

Hard sentence words ≥

Core counting & writing metrics

Start with the broad counter that matches the question, then move to focused frequency, reading-time or syllable analysis. Specialist readability, repetition and writing-goal tools remain available from the full hub.

All 28 text analysis tools

Word CounterWords, characters, structure & reading time Character CounterCharacters, code points & limits Sentence CounterSentence count & average length Paragraph CounterParagraph blocks, words & lines Line CounterLogical, empty & non-empty lines Word FrequencyTop terms & vocabulary diversity Reading TimeWords to minutes at a chosen WPM Syllable CounterSyllable estimate & density

English-model coverage is visible before trusting a Flesch score

Flesch Reading Ease and Flesch-Kincaid Grade are English-language formulas. The review reports English-token coverage, sample size, sentence segmentation, and the heuristic syllable boundary instead of presenting a universal readability score.