Readability Checker
Check how easy your text is to read and understand
Readability Checker scores English prose with Flesch Reading Ease and Flesch-Kincaid Grade Level, then shows sentence and syllable averages plus rewrite suggestions. It is a quick way to gauge whether a draft feels too dense for the audience you are writing for.
All processing runs locally in your browser. Your files and text are not sent to Tool-web's server.
How to Use
- Paste your text into the input area
- Click "Check Readability" to analyze
- Review the readability scores and grade level
- Get suggestions for improvement
Features
- Flesch Reading Ease score
- Flesch-Kincaid Grade Level
- Coleman-Liau Index
- SMOG Index
- Improvement suggestions
Tips for getting Readability Checker right
- Aim for 60–70 for general web content — roughly a well-edited newspaper article
- If the score is low, hunt for the longest sentences first; splitting one 40-word sentence often lifts the whole score
- Technical documentation can legitimately score lower — match the audience, not a magic number
- Use the built-in suggestions as rewrite prompts rather than as strict rules
Interpreting the score
| Flesch score | Reading level | Typical content |
|---|---|---|
| 90–100 | 5th grade | Children's books, simple instructions |
| 80–89 | 6th grade | Popular fiction, plain-language summaries |
| 70–79 | 7th grade | Blog posts, marketing copy |
| 60–69 | 8th–9th grade | Newspaper articles, well-edited web content |
| 50–59 | 10th–12th grade | Business reports, technical blogs |
| 0–49 | College+ | Legal text, academic papers |
How the formula works
Flesch Reading Ease = 206.835 − 1.015 × (words per sentence) − 84.6 × (syllables per word). Two levers move the score: shorter sentences and words with fewer syllables. The formula was calibrated on English prose, so scores for code snippets, lists, or non-English text are not meaningful.
What to do with a 45
Don't rewrite everything. Find your five longest sentences and ask whether each carries two ideas. Split them, replace nominalizations ("implementation of the feature" → "we implemented the feature"), and re-run. Scores respond quickly because average sentence length dominates the calculation.
What the tool is really measuring
The underlying formulas care about average sentence length and average syllables per word, not truth, originality, or style. A concise but misleading paragraph can score well; a precise technical explanation can score badly. Use the score as one editing signal, not the final verdict on quality.
Real-World Use Cases
- Checking whether marketing copy is simple enough for a broad audience
- Reviewing help-center articles before publishing them to non-technical readers
- Comparing two versions of the same draft after a simplification pass
- Spotting when long sentences are dragging down a proposal or report
- Exporting a quick readability summary for an editor, client, or teammate
Best Practices
- Use the score after a full draft exists, not sentence by sentence while you are still outlining
- Review average words per sentence first because that is usually the easiest lever to improve
- Replace abstract noun-heavy phrases with direct verbs before rewriting the whole paragraph
- Compare the result against the real audience, whether that is customers, students, or specialists
- Re-run the tool after each major edit round so you can see whether the changes actually helped
Common Mistakes to Avoid
- Treating the score as a universal quality judgment instead of an audience-fit signal
- Running the tool on bullet lists, code, or heavily structured content and expecting meaningful prose metrics
- Forcing highly technical documentation to hit a generic consumer-content score target
- Obsessing over a one-point score difference instead of fixing the sentences causing the drag
- Ignoring the suggestions list after the metrics reveal exactly where the draft is hard to read
Troubleshooting
- If the score seems wrong, remove code blocks, long URLs, or pasted lists that distort the sentence split
- If the grade level stays high, break the longest sentences before swapping vocabulary everywhere
- If technical terms are unavoidable, shorten the surrounding sentences to balance them out
- If the report says the text is difficult but the audience is expert, treat that as context rather than failure
- If you need deeper diagnostics, pair the result with Text Statistics or manual editing notes
Frequently Asked Questions
What do the scores mean?
What is a good readability score?
How can I improve readability?
Privacy & Security
Analysis runs locally in your browser. Drafts are never uploaded.
Tips & Best Practices
- Aim for 60–70 for general web content — roughly a well-edited newspaper article
- If the score is low, hunt for the longest sentences first; splitting one 40-word sentence often lifts the whole score
- Technical documentation can legitimately score lower — match the audience, not a magic number
- Use the built-in suggestions as rewrite prompts rather than as strict rules
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