Readability Score Calculator

Paste your text to instantly calculate the Flesch Reading Ease index, grade levels, and reading time metrics.

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Understanding Readability Scales

Readability metrics evaluate how easily a document can be comprehended by readers. The Flesch Reading Ease test is widely regarded as one of the most reliable and industry-standard mathematical models for auditing copy quality.

The Flesch Index Scores

Flesch Reading Ease Formula
Score = 206.835 − 1.015 × (Words ÷ Sentences) − 84.6 × (Syllables ÷ Words)
Flesch-Kincaid Grade Level Formula
Grade = 0.39 × (Words ÷ Sentences) + 11.8 × (Syllables ÷ Words) − 15.59

The index translates mathematically to specific difficulty tiers:

  • 90–100: Very Easy (5th grade level, easily understood by an average 11-year-old student)
  • 60–70: Standard (8th–9th grade level, typical for news blogs and conversational articles)
  • 30–50: Difficult (College graduate level, complex academic or technical papers)
  • 0–30: Very Confusing (Professional/legal texts, requiring advanced postgraduate training)

Interpreting Your Flesch Reading Ease Score

The Flesch Reading Ease formula scores text from 0 to 100 based on average sentence length and average syllables per word — higher scores mean easier reading. A score of 90–100 corresponds to text easily understood by an average 11-year-old, while a score below 30 indicates dense, academic-level writing best understood by university graduates.

This makes it a useful quick check for whether your writing matches its intended audience: marketing copy and general web content typically aims for 60–70 (plain English, easily understood by 13–15 year olds), while technical or legal documents naturally score lower given their necessarily precise, complex language.

  • 90–100: Very easy — understood by an average 11-year-old.
  • 60–70: Plain English — the target for most general web and marketing content.
  • 30–50: Fairly difficult — college-level reading.
  • 0–30: Very confusing — best suited to graduate or academic readers.
Readability FAQ

Frequently Asked Questions

Learn how reading index formulas work and what score you should target.

For standard web content, blogs, and marketing copy, you should target a Flesch Reading Ease score of 60 to 70. This ensures your articles are accessible to about 80% of English readers.
Flesch Reading Ease outputs a score from 0 to 100 (higher is easier). Flesch-Kincaid Grade Level translates this score directly into US school grade levels (e.g. a score of 8.0 indicates the text matches 8th-grade reading abilities).
Because English spelling is irregular, syllables are counted by recognising common vowel patterns (like 'ea', 'oi') and ignoring a silent final 'e'. This gives about 90%+ accuracy.
No, standard formulas only analyze sentence structures, word lengths, and syllable rates. However, visual formatting heavily aids human readability, so bullet points and headings are highly recommended.
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