Readability Checker
Paste any text to calculate its Flesch Reading Ease score and Flesch-Kincaid Grade Level. Understand how easy or difficult your writing is to read and how to improve it.
⏱ 4 min read · Complete guide below
Readability Checker
How to Use the Readability Checker
- 1Paste your text into the box — an email, blog draft, or product description.
- 2Read the Flesch Reading Ease score (0–100, higher is easier) and the Flesch-Kincaid Grade Level.
- 3Compare the score against your target audience — 60–70 for general web, 70–80 for marketing copy.
- 4Shorten long sentences and swap complex words, then re-check to see the score climb.
Worked Example: Fixing One Dense Sentence
The Flesch Reading Ease formula is 206.835 − 1.015 × (words per sentence) − 84.6 × (syllables per word). The two levers are right there: sentence length and word complexity. Take a 30-word sentence averaging 1.8 syllables per word. Its score is 206.835 − 1.015 × 30 − 84.6 × 1.8 ≈ 206.835 − 30.45 − 152.28 ≈ 24 — the “very difficult” band, the reading level of a dense academic paper.
Now split it into two 15-word sentences and swap a few polysyllabic words for plainer ones, bringing the average down to 1.5 syllables. The new score is 206.835 − 1.015 × 15 − 84.6 × 1.5 ≈ 206.835 − 15.225 − 126.9 ≈ 65 — “standard” plain English readable by most adults. Nothing about the meaning changed; only the sentence length and word choice did. That is why the two edits the tool keeps recommending — shorter sentences, simpler words — move the needle so much more than anything else.
Why Readability Matters — and What the Score Can't See
Readability is not about “dumbing down” your writing; it is about respecting the reader's time and attention. Most people read on screens, often distracted and skimming, and clearer prose reaches more of them: it is understood faster, remembered better, and abandoned less often. That is why plain-language standards are used in everything from journalism to legal disclosures to government forms, and why matching your score to your audience — easier for a broad web readership, denser for a specialist journal — matters more than hitting any single number. It is equally important to know the formula's blind spots. Flesch scores measure only two mechanical things: how long your sentences are and how many syllables your words have. They cannot judge whether your argument is logical, your word choice precise, your structure coherent, or your facts correct. That means the score is easy to game — chopping every sentence in half and swapping in shorter but vaguer words can raise the number while making the writing worse. Use the score the right way: as a quick check that flags genuinely dense passages worth revisiting, not as a target to maximise. Good editing improves the score as a side effect of making the meaning clearer.
Flesch Reading Ease Score Reference
90–100: Very Easy
Understood by an average 11-year-old. Used in children's books and simple instructions. Short sentences, one-syllable words dominate.
70–90: Easy
Plain English. Suitable for general web content, marketing copy, and consumer-facing product descriptions. Newspapers like USA Today target this range.
60–70: Standard
Average readability. The New York Times and most business writing falls here. Accessible to most adults who are comfortable readers.
30–60: Difficult
College-level reading. Academic journals, legal documents, and technical writing typically score here. Requires focused reading to understand.
0–30: Very Difficult
Expert-level text. Graduate academic papers, dense legal contracts, and highly technical documentation. Best understood by specialists in the field.
How to Improve
Split long sentences. Replace polysyllabic words with shorter synonyms. Use the active voice. These three changes have the biggest impact on your score.
Frequently Asked Questions
What is the Flesch Reading Ease score?
The Flesch Reading Ease score rates text on a scale of 0–100. Higher scores mean easier reading. Scores of 60–70 are considered standard (plain English). Scores above 80 are very easy (simple English). Scores below 30 are very difficult (university-level text). The formula weights average sentence length and average syllables per word.
What is the Flesch-Kincaid Grade Level?
The Flesch-Kincaid Grade Level maps text complexity to a US school grade level. A score of 8.0 means the text is readable by an 8th-grader. Most newspapers target Grade 8–12. Technical or academic writing often scores Grade 14+ (college level). Lower scores indicate more accessible writing.
How can I improve my readability score?
The two biggest factors are sentence length and word complexity. To improve your score: split long sentences (over 25 words) into two shorter ones; replace multi-syllable words with simpler synonyms where possible; use the active voice (shorter sentence structures); and avoid nested clauses.
What readability score should I aim for?
It depends on your audience. General web content: aim for 60–70 (standard). Marketing copy and landing pages: aim for 70–80 (easy). Technical documentation: 50–60 is acceptable. Academic papers: 30–50. Children's content: 80–100. The key is matching complexity to your reader's expected level.
Why is my score different from other readability tools?
Syllable counting algorithms vary between tools — accurate syllable counting in English is a hard problem due to exceptions and irregularities. Different tools use different heuristic algorithms, which can produce slightly different syllable counts and therefore different scores. Results across tools may differ by a few points.
Does the tool support languages other than English?
The Flesch formulas were designed for English text and calibrated on English syllable patterns. The tool will produce a numeric result for other languages, but the score will not be meaningful in the same way, as syllable counting uses English heuristics.