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How It Works
No account needed, no sign-up required. Completely free. Paste your text and get instant Flesch Reading Ease and grade-level scores with a full breakdown of what to improve.
Copy any block of text and paste it into the input field. Blog posts, product descriptions, emails, landing pages, legal copy. This free readability calculator handles all of them.
The calculator analyzes your text instantly and returns your Flesch Reading Ease score, Flesch-Kincaid Grade Level, and key stats like average sentence length and syllable count. No sign-up required.
See exactly where your text lands on the readability scale, which audience it suits, and what to change. Shorter sentences, simpler words, and clearer structure all push your score higher.
The Formula
This free readability calculator uses two proven formulas developed by Rudolf Flesch and J. Peter Kincaid. Here is the full breakdown.
Flesch Reading Ease
206.835 - 1.015 x (total words / total sentences) - 84.6 x (total syllables / total words)
Example: A 200-word passage with 10 sentences and 280 syllables = score of 66.4 (Standard)
Flesch-Kincaid Grade Level
0.39 x (total words / total sentences) + 11.8 x (total syllables / total words) - 15.59
Example: Same passage above = grade level 8.1 (8th grade reading level)
The Flesch Reading Ease score runs from 0 to 100. Higher numbers mean easier reading. A score of 60 to 70 is considered standard and readable by most adults. Scores below 30 typically require a graduate-level education to parse comfortably.
The Flesch-Kincaid Grade Level converts that same analysis into a U.S. school grade. A grade level of 8.0 means an average eighth grader can understand the text. Most popular content on the web targets a 6th to 8th grade reading level because it maximizes reach without sacrificing depth.
Both formulas rely on two core inputs: average sentence length and average syllable count per word. Shorter sentences and simpler words push scores toward easier reading. Longer sentences and multisyllable words push scores toward harder reading. The relationship is linear, which means every improvement you make has a measurable impact on the final score.
Content readability directly affects engagement. Research from the Nielsen Norman Group in 2026 shows that lowering reading level by two grades increases time on page by 22% and reduces bounce rate by 15%. Simpler writing is not dumbed-down writing. It is clearer communication.
Score Guide
Use this table to interpret your Flesch Reading Ease score. Each range maps to a difficulty level and approximate U.S. grade level so you know exactly who can comfortably read your content.
| Score Range | Difficulty | Grade Level |
|---|---|---|
| 90 - 100 | Very Easy | 5th grade |
| 80 - 89 | Easy | 6th grade |
| 70 - 79 | Fairly Easy | 7th grade |
| 60 - 69 | Standard | 8th - 9th grade |
| 50 - 59 | Fairly Difficult | 10th - 12th grade |
| 30 - 49 | Difficult | College |
| 0 - 29 | Very Difficult | Graduate |
Sources: Flesch, R. (1948); Kincaid, J.P. et al. (1975). Derivation of New Readability Formulas for Navy Enlisted Personnel.
Readability by Content Type
Different content formats demand different reading levels. Use these benchmarks to set the right target score before you start writing or editing.
| Content Type | Target Score | Notes |
|---|---|---|
| Blog posts | 60 - 70 | Conversational tone, scannable paragraphs. Aim for 8th-9th grade level to reach the widest audience. |
| Product descriptions | 60 - 80 | Short, benefit-driven sentences. Shoppers skim, so every word must earn its place. |
| Legal / Terms of service | 30 - 50 | Typically college-level by necessity, but plain-language rewrites improve compliance and trust. |
| Email campaigns | 60 - 80 | Easy reading drives higher open-to-click rates. Keep sentences under 20 words for mobile screens. |
| Social media captions | 70 - 90 | Ultra-short, punchy, and casual. The simpler the language, the higher the engagement. |
| Academic papers | 20 - 40 | Complex vocabulary is expected, but clear structure and transition words still improve comprehension. |
Benchmarks based on industry analysis and content performance data, 2026.
What Kills Readability
Most readability problems come from writing habits, not topic complexity. These six mistakes silently push readers away and drag your scores down.
Sentences that stretch past 25 words force readers to hold too many ideas in memory at once. By the time they reach the period, they have forgotten the beginning. Break long sentences into two or three shorter ones for immediate clarity.
Aim for 15-20 words per sentence on averagePassive constructions ("the report was written by the team") add unnecessary words and obscure who is doing what. Active voice ("the team wrote the report") is shorter, stronger, and easier to process.
Keep passive voice under 10% of total sentencesIndustry-specific language creates a barrier for anyone outside your field. If a simpler word exists, use it. When technical terms are unavoidable, define them on first use so readers stay with you.
Replace jargon with plain alternatives wherever possibleA page without headings looks like an unbroken wall of text. Readers scan before they commit to reading. Headings give them anchor points, signal what each section covers, and let them jump to what matters most.
Add a subheading every 200-300 wordsDense paragraphs with no visual breathing room cause readers to disengage. White space is not wasted space. Short paragraphs, bullet lists, and images break content into digestible chunks that keep people scrolling.
Keep paragraphs to 3-4 sentences maximumWords with three or more syllables slow reading speed and reduce comprehension. "Use" beats "utilize." "Help" beats "facilitate." Simple words communicate faster and feel more natural to every reader.
Swap multisyllable words for shorter synonymsImprove Your Readability
These strategies make your content easier to read, scan, and act on. All CommonNinja widgets mentioned below are free to start.
When your page has detailed explanations or FAQ-style content, collapse it into expandable sections. Readers see a clean layout and expand only what interests them. This keeps the page scannable without cutting important information.
Try Accordion widget →Tabs let you present multiple topics in the same space without overwhelming the reader. Instead of stacking sections that force endless scrolling, group related content into labeled tabs. Readers pick what they need and skip the rest.
Try Tabs widget →When you need to present options, features, or pricing side by side, a comparison table communicates in seconds what paragraphs of text cannot. Tables reduce cognitive load and let readers make decisions faster.
Try Comparison Tables widget →Definitions, disclaimers, and supplementary details belong in popups rather than inline text. Popups keep the primary reading flow clean while giving curious readers instant access to extra context on demand.
Try Popup Builder widget →Active voice puts the subject first, making sentences shorter and more direct. "We analyzed 500 articles" is clearer than "500 articles were analyzed by us." Scan your draft for "was," "were," and "by" to find passive constructions and flip them.
Every industry has shorthand that insiders understand but outsiders do not. Before publishing, read your text as if you are encountering the topic for the first time. If a word has a simpler synonym, use it. Clarity always wins.
Long sentences are the single biggest readability killer. After writing your first draft, go back and split any sentence over 25 words. If a sentence has two ideas, it should be two sentences. Your readability score will climb immediately.
Subheadings act as signposts that guide readers through your content. They make long pages scannable, improve SEO by signaling topic structure to search engines, and give skimmers enough context to decide what to read in full.
Readability Metrics Glossary
Multiple readability formulas exist, each with different strengths. Here is how the most widely used metrics compare and when to reach for each one.
| Metric | Definition | Formula | When to Use |
|---|---|---|---|
| Flesch Reading Ease | Scores text from 0 to 100 based on sentence length and syllable count. Higher scores mean easier reading. The most widely used readability metric in content marketing and UX writing. | 206.835 - 1.015(words/sentences) - 84.6(syllables/words) | General content audits, blog optimization, UX copy review |
| Flesch-Kincaid Grade | Converts the Flesch formula into a U.S. school grade level. A score of 8.0 means an average 8th grader can understand the text. Used heavily in government, healthcare, and education. | 0.39(words/sentences) + 11.8(syllables/words) - 15.59 | Compliance documents, patient materials, government content |
| Gunning Fog Index | Estimates the years of formal education needed to understand a passage on first reading. Factors in sentence length and the percentage of complex words (three or more syllables). | 0.4 x ((words/sentences) + 100(complex words/words)) | Business writing, journalism, technical documentation |
| SMOG Index | Predicts the grade level required to understand a piece of writing by counting polysyllabic words. Considered more accurate than other formulas for health-related content. | 3 + sqrt(polysyllable count x (30/sentences)) | Healthcare materials, pharmaceutical labeling, public health |
| Coleman-Liau Index | Uses character count instead of syllable count, making it easier to compute programmatically. Relies on average number of letters per 100 words and average number of sentences per 100 words. | 0.0588(L) - 0.296(S) - 15.8 | Automated readability pipelines, large-scale content analysis |
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