Free Readability Score Calculator
Check how demanding your English text may be to read. Calculate Flesch Reading Ease, Flesch–Kincaid Grade Level and Gunning Fog, then review long sentences, complex-word examples and estimated reading time.
Use the results to find passages worth revising in an article, essay, guest post or webpage. Readability formulas describe features of the writing; your reader, subject and purpose determine which changes will help.
Paste English text below. The calculator requires at least 10 words, and the input field accepts up to 50,000 characters. Several complete paragraphs usually provide a more useful sample than a headline or isolated sentence.
Processing note: Your text is sent to EduGuestPost’s analysis service to calculate the results. See our privacy policy for the site’s data-handling information.
Review the writing behind the score
Paste a complete passage. Run a check, inspect the evidence, then compare your revision.
Review the passage behind each estimate
Additional formulas, separate results
Coleman–Liau uses letters and sentence counts; ARI uses letters and digits with sentence length. SMOG is withheld below 30 detected sentences. No combined grade or official reading-age assessment is implied.
Audience and sentence goals
Choose an editorial audience preset or your own grade target, and adjust the long-sentence threshold. These preferences do not change the original formula counts or certify comprehension. The legacy over-25-word metric remains available.
Compare two checked versions
Pin a report as the baseline, edit your passage, and run another check. Compare named metrics and settings while both versions remain in this page’s memory. Reloading discards this comparison; it is not account history or automatic saving.
Paragraphs and normalized evidence
Paragraph review preserves blank-line breaks in a separately normalized text view. Full-passage sentence evidence uses the legacy analyzer’s normalized text. Each view identifies its scope; short paragraph scores are unstable estimates, not comprehension tests.
What your readability report includes
The report retains the original three formulas and adds separate Coleman–Liau and ARI estimates, plus SMOG when its minimum sample is met. Start with the individual scores, then look at the sentences and words behind them.
| Result | What it helps you review |
|---|---|
| Flesch Reading Ease | A reading-difficulty estimate based on average sentence length and estimated syllables per word. Higher scores generally indicate easier wording and sentence structure. |
| Flesch–Kincaid Grade Level | A formula-based estimate expressed on a U.S. school-grade scale. It describes the text, rather than measuring a reader’s ability. |
| Gunning Fog | An estimate using average sentence length and the proportion of words counted as complex by the calculator. |
| Long-sentence examples | Sentences counted as having more than 25 words, with a word count and a text excerpt. |
| Complex-word examples | Words with three or more estimated syllables, together with their counts and syllable estimates. |
| Text statistics | Word and sentence counts, estimated syllables, complex-word percentage, average sentence length and average word length in characters. |
| Reading time | A whole-minute estimate for reading the supplied text. Actual reading speed depends on the reader and material. |
The report shows complete sentence evidence and a highlighted view of the normalized analyzed passage, alongside complex-word examples. A flagged term may be the correct name or technical word for the subject. A long sentence may also be clear when its structure is easy to follow.
How to use the readability calculator
- Choose a representative passage. Include complete sentences from the content you want to improve. For an article or webpage, use the main copy rather than navigation labels or a list of disconnected keywords.
- Run the check. Review the individual scores alongside average sentence length, complex-word percentage and reading time.
- Inspect the examples. Find sentences that carry several ideas, and consider whether unfamiliar words need an explanation or a simpler equivalent.
- Revise with the reader in mind. Preserve important conditions, source attribution and technical meaning. Change wording only when it improves the explanation.
- Run the revised text again. Compare the results, then read the passage aloud or ask a representative reader to explain its main point.
The calculator evaluates the text submitted for that check. After editing the input, run another check to obtain results for the new version.
How to interpret Flesch Reading Ease
Flesch Reading Ease combines sentence length with syllables per word. Shorter sentences and shorter words generally produce a higher score. These commonly used bands offer a starting point for interpreting the result.
| Displayed score | General interpretation |
|---|---|
| 90–100 | Very easy |
| 80 to below 90 | Easy |
| 70 to below 80 | Fairly easy |
| 60 to below 70 | Standard |
| 50 to below 60 | Fairly difficult |
| 30 to below 50 | Difficult |
| Below 30 | Very difficult |
Treat these descriptions as broad guidance. Familiar technical language can be clear to a specialist, while a short passage about an unfamiliar subject can still confuse a general reader.
The calculator displays Reading Ease on a bounded 0–100 scale. The underlying formula can produce values outside that range, so a displayed zero can represent an especially dense sample. A score of 100 does not establish that every reader will understand the text.
Flesch–Kincaid grade level and Gunning Fog
Flesch–Kincaid Grade Level expresses a text estimate in U.S. grade-level terms. A result of 8 suggests approximately eighth-grade difficulty under that formula. It is not an assessment of a student, a precise reading-age conversion or a certification for an audience.
Gunning Fog also rises with longer sentences, but its vocabulary component uses the percentage of complex words. In this calculator, the complex-word examples use estimated syllable counts. Proper names, specialist terms and abbreviations can affect those estimates.
Different formulas can disagree because they measure different features. Review each result in context rather than averaging unlike score scales or selecting whichever number looks most favorable.
The formulas behind the results
Let ASL mean average words per sentence, ASW mean average estimated syllables per word, and CW% mean the percentage of words counted as complex.
| Measure | Formula |
|---|---|
| Flesch Reading Ease | 206.835 − (1.015 × ASL) − (84.6 × ASW) |
| Flesch–Kincaid Grade Level | (0.39 × ASL) + (11.8 × ASW) − 15.59 |
| Gunning Fog | 0.4 × (ASL + CW%) |
The current results use estimated English syllables and the calculator’s own word and sentence counts. Simple text can produce a negative raw Flesch–Kincaid result; the displayed grade level has a floor of zero.
Microsoft explains the two Flesch formulas in its readability statistics documentation. Calculators can return different values when their sentence detection, syllable rules, complex-word definitions or display rounding differ.
A measured example: divide a crowded sentence into clear steps
Here is an editorial passage checked with this calculator on 9 October 2026. The revision separates the review process into shorter statements while retaining its central requirements.
Original passage
Prior to the commencement of publication, our editorial team undertakes an assessment of the submitted article in order to confirm that its sources are identified, that quotations are accurately presented, and that the proposed revisions preserve the meaning of the original explanation while remaining consistent with the requirements of the selected publisher.
Revised passage
Our editors review the article before publication. They check that sources are named and quotations are accurate. They also check each proposed change against the original explanation. The revision must preserve its meaning and meet the selected publisher’s requirements.
| Calculator result | Original | Revision |
|---|---|---|
| Words counted by the tool | 52 | 40 |
| Sentences | 1 | 4 |
| Average words per sentence | 52 | 10 |
| Flesch Reading Ease, displayed | 0 | 44.4 |
| Flesch–Kincaid Grade Level, displayed | 27.8 | 9.6 |
| Gunning Fog | 33.1 | 14 |
| Sentences over 25 words | 1 | 0 |
This is a controlled illustration using short passages, rather than a comprehension study. The tool’s counting rules produced these values; punctuation and word handling can differ from a manual count or another calculator. The revised version still contains subject-specific words, so the formulas continue to show some difficulty.
The useful change is easier-to-follow sequencing. Readers can identify what happens before publication, what the editors check and which requirements a revision must satisfy.
Improve readability while preserving meaning
Give each sentence a clear job
Look for sentences that combine a process, exception, justification and conclusion. Separating them can help readers follow the sequence. Keep necessary connections between cause, evidence and outcome.
Choose familiar words when they are accurate
“Before” may serve the same purpose as “prior to the commencement of.” A specialist term may need to stay. Define it at first use, and use it consistently throughout the passage.
Make the structure easy to scan
Use headings that describe the section, paragraphs that develop one main idea and lists for parallel steps or options. A readability formula cannot fully evaluate whether that structure answers the reader’s question.
Keep qualifications and evidence
Words such as “may,” “estimated” or “in this sample” can be essential to an accurate claim. Remove empty repetition, but preserve conditions, exceptions, quotations and source attribution.
Check the result with a person
Ask whether a reader can identify the next step, explain the main point and understand any limits. Reading aloud can reveal awkward transitions that a formula misses.
Readability for articles, essays and guest posts
For an article or guest post, assess the main explanation and the passages containing instructions, evidence or specialist terminology. Consider the publisher’s audience and editorial standards when deciding how much background to include.
For an essay, keep terms required by the subject and explain how the evidence supports the argument. A lower grade estimate does not automatically make the analysis stronger.
For help content and landing pages, make the reader’s next step explicit. Clear labels, useful headings and complete explanations matter alongside sentence length.
If you need help developing a publication-ready article, explore our guest post content writing service. Readability review can support drafting and editing; publication suitability also depends on research, relevance and the publisher’s requirements.
Does a readability score help SEO?
Clear explanations can make a page easier to use. A numerical readability target cannot establish that a page deserves to rank, matches a search query or provides reliable information.
Use the calculator as part of an editorial review: answer the reader’s question, explain terms, organize the content and support factual claims. Google’s people-first content guidance emphasizes useful, reliable content and does not prescribe a preferred word count. Treat any fixed “SEO reading grade” as an editorial preference rather than a ranking guarantee.
What a readability score can miss
The formulas focus on counts. They do not establish factual accuracy, originality, source quality, usefulness or whether a reader has understood the passage.
They also have practical limits:
- Short samples: One sentence or a brief slogan can produce an extreme result. Use complete, representative passages when possible.
- Technical language and names: A necessary long word may be familiar to the intended reader. Estimated syllables can misclassify a name or abbreviation.
- Other languages: These results are designed for English. English formulas and syllable estimates should not be applied as equivalent assessments of other languages.
- Formatting and punctuation: Tables, code, bullet fragments, unusual punctuation and abbreviations can affect word and sentence detection.
- Audience knowledge: The same passage can be straightforward for an expert and difficult for a newcomer.
Readability results also do not certify accessibility. The W3C’s Reading Level guidance addresses a specific WCAG Level AAA criterion, including simplified or supplemental content in applicable circumstances. A calculator score alone cannot demonstrate compliance.
Frequently asked questions
What is a readability score?
A readability score estimates how demanding a text may be using features such as sentence length, syllables and word complexity. It describes the supplied passage and its counting rules, rather than measuring a reader’s comprehension.
Is this readability calculator free?
Yes. The current calculator is available as a free tool. Paste English text into the field and select Run check.
Which scores does this tool calculate?
It calculates Flesch Reading Ease, Flesch–Kincaid Grade Level and Gunning Fog, with Coleman–Liau and Automated Readability Index estimates. SMOG is shown only for samples with at least 30 detected sentences. The report also includes text counts, complete sentence and paragraph evidence, raw scores and adjustable reading and speaking-time estimates.
How much text should I enter?
The current check requires at least 10 words. The form allows up to 50,000 characters. Several complete paragraphs usually give a more representative picture than the minimum input.
What is a good readability score?
A useful target depends on the audience and purpose. General instructions often benefit from familiar words and manageable sentences, while specialist writing may require technical vocabulary. Review the actual passage instead of relying on one universal score.
Does a grade-level result show a reader’s age?
No. Flesch–Kincaid uses a U.S. grade-level scale to estimate text difficulty. It is not a precise age conversion, a student assessment or an international qualification.
Why are the Flesch–Kincaid and Gunning Fog results different?
Flesch–Kincaid uses estimated syllables per word. Gunning Fog uses the proportion of words counted as complex. Their different inputs and calibrations can produce different estimates for the same text.
Can I upload a document or check a webpage URL?
Paste English text or load a UTF-8 TXT file locally, then review the text field before running the server check. TXT files must be no larger than 200 KB and the passage must fit the 50,000-unit field limit. DOCX, PDF and webpage-URL retrieval are not included; copy the passage from those sources.
Can I save or export my results?
Copy the report, download JSON, CSV or a plain-text summary, or print the results. Reports identify the check time, method version, settings and input identity. Draft text is excluded from exports unless you select the text-inclusion control. These exports do not create a revised Word document.
Will the calculator rewrite my text or detect plagiarism?
The current readability check analyzes the supplied text. Make your own edits and run another check. Originality and source comparison require a separate review or tool.
How accurate is the reading-time estimate?
The original metric uses 220 words per minute, rounded up to at least one whole minute. The report also shows second-based estimates using your selected reading and speaking speeds. Real time varies with complexity, familiarity and the reader; the selected speeds are planning assumptions.
Does the text stay entirely in my browser?
The current check sends the text to the site’s analysis service. Consult the linked privacy policy for data-handling information. The score itself does not create a WordPress draft or publish the supplied text.
Check your next draft
Paste a representative passage, review the scores and examine the sentences behind them. Revise the parts that make your explanation harder to follow, then run the check again.
Optional editorial inquiry
Share your audience and the metric summary you choose to discuss. The calculator does not transfer your full draft automatically or place an order.