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Flesch Readability Score

Calculate Flesch Reading Ease and Flesch-Kincaid Grade Level scores to measure how readable your text is.

About Flesch Readability Score

The Flesch Readability Score calculator analyzes text and returns two widely used readability metrics: Flesch Reading Ease (FRE) and the Flesch-Kincaid Grade Level (FKGL). Reading Ease scores range from 0 to 100 — higher scores mean easier to read (100 = very easy, 0 = very hard). The Grade Level score corresponds to approximate US school grade level needed to comprehend the text comfortably. Both formulas are based on average sentence length and average syllable count per word. The tool also shows word count, sentence count, and average syllables per word so you can see exactly what is driving your score and how to improve it.

Why use Flesch Readability Score

  • Calculates both Flesch Reading Ease and Flesch-Kincaid Grade Level simultaneously.
  • Shows sentence and syllable breakdowns to pinpoint complexity drivers.
  • Used by writing tools, academic institutions, and plain-language advocates.
  • Runs in real time so you can adjust phrasing and see immediate feedback.
  • Standard scoring used by Microsoft Word, Hemingway, and most plain-language tools.
  • Helps comply with US federal Plain Writing Act guidelines.

How to use Flesch Readability Score

  1. Paste your text into the input area.
  2. The Reading Ease and Grade Level scores update instantly.
  3. Review the breakdown stats (sentences, words, syllables) to understand the score.
  4. Edit your text and watch the scores change in real time to guide improvements.
  5. Watch how Reading Ease and Grade Level shift as you edit longer sentences into shorter ones.
  6. Aim for sentences under 20 words and most words under 3 syllables for plain-language writing.
  7. Compare scores across drafts to confirm your edits actually simplify the text.

When to use Flesch Readability Score

  • Checking whether website copy or blog posts are accessible to your target audience.
  • Reviewing government or legal documents for plain-language compliance.
  • Academic writing where a target reading level must be met.
  • Editing marketing copy to ensure it reads at an appropriate grade level.
  • Tuning customer support knowledge base articles to a non-expert audience.
  • Auditing healthcare or financial communications for plain-language compliance.

Examples

Easy text

Input: The cat sat on the mat. The dog ran away.

Output: Reading Ease: 116.1 (very easy) | Grade Level: -1.5 (early elementary)

Medium text

Input: The committee deliberated extensively before reaching a unanimous decision.

Output: Reading Ease: 18.2 (very difficult) | Grade Level: 16.0 (college graduate)

Standard prose

Input: We work to make complex ideas easy to understand. Our team writes clearly.

Output: Reading Ease: 78.5 (fairly easy) | Grade Level: 4.4 (4th grade)

Tips

  • Aim for Reading Ease 60-70 and Grade Level 8 for general web content.
  • Government and legal plain-language work targets Reading Ease 65+ or Grade Level 6-8.
  • Break long sentences with conjunctions ('and', 'but') into separate sentences to drop the grade level fast.
  • Replace polysyllabic Latin/Greek words with shorter Anglo-Saxon equivalents (e.g. 'use' instead of 'utilize').
  • Don't optimize too aggressively — over-simplifying technical content can lose accuracy and trust.

Frequently Asked Questions

What is a good Flesch Reading Ease score?▾
60-70 is considered standard and easily understood by most adults. Scores above 80 are very easy; below 30 are very difficult (academic or technical).
How is syllable count calculated?▾
The tool uses a heuristic algorithm (similar to CMU Pronouncing Dictionary rules) to estimate syllable counts without a full phonetic dictionary.
Is the grade level based on US school grades?▾
Yes. A grade level of 8 means an average US 8th grader can understand the text.
Does it work for non-English text?▾
The formulas were designed for English. Results for other languages are approximate at best.
Should I always aim for a low grade level?▾
Not necessarily. Technical, legal, or scientific writing for expert audiences may appropriately score at higher grade levels.
What's the formula for Flesch Reading Ease?▾
FRE = 206.835 - 1.015 × (words/sentences) - 84.6 × (syllables/words). Higher is easier.
What is the Flesch-Kincaid Grade Level formula?▾
FKGL = 0.39 × (words/sentences) + 11.8 × (syllables/words) - 15.59. Result corresponds to US school grade level.
Why might my score be misleading?▾
Both formulas only consider sentence and syllable length. They don't account for word frequency, abstractness, or jargon — short common words can still convey complex ideas, and long simple words can be easy to read.

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Glossary

Flesch Reading Ease (FRE)
A 0-100 readability score where higher is easier; calculated from sentence length and syllable density.
Flesch-Kincaid Grade Level (FKGL)
A score corresponding to US school grade level required to comprehend the text.
Syllable
A unit of pronunciation containing a single vowel sound, with or without surrounding consonants.
Plain language
Writing that's clear, concise, and well-organized — readable on first reading.
Sentence
A grammatical unit ending in a period, question mark, or exclamation mark; a key input to readability formulas.
Lexical density
The proportion of content words (nouns, verbs, adjectives) to total words; high density correlates with reading difficulty.