Text Analyzer — Readability Scores

This text analyzer scores how easy your writing is to read. It estimates six readability measures — Flesch Reading Ease, Flesch–Kincaid Grade Level, Gunning Fog, SMOG, Coleman–Liau and the Automated Readability Index — and lists your longest sentences, the usual culprits when a score is low. Use it to pitch a blog post, report, school assignment or product page at the right level for its readers.

How to use this tool

1. Paste your text — a few paragraphs give steadier scores than a single sentence.
2. Set the sentence length you consider too long (25 words is a common limit).
3. Read the Reading Ease score and the grade levels.
4. Shorten the flagged sentences or swap long words for shorter ones, then paste again.

Formula

Flesch Reading Ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)

Flesch–Kincaid Grade = 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59

Simplified Fog = 0.4 × (words per sentence + 100 × 3+ syllable words ÷ words), without exclusions for names, compounds or suffixes. SMOG = 1.043 × √(complex words × 30 ÷ sentences) + 3.1291. Coleman–Liau uses letters per 100 words (L) and sentences per 100 words (S): 0.0588L − 0.296S − 15.8. ARI = 4.71 × characters per word + 0.5 × words per sentence − 21.43.

Example

The sample text about cold brew has 87 words (the numbers 12 and 24 are not counted), 7 sentences and an estimated 117 syllables: 12.43 words per sentence and 1.345 syllables per word. Reading Ease = 206.835 − 1.015 × 12.43 − 84.6 × 1.345 = 80.4, which Flesch rates "easy", and the Flesch–Kincaid grade is 5.1. The longest sentence has 19 words, well under the 25-word limit.