Readability Score Checker
Paste your text to get Flesch Reading Ease and Flesch-Kincaid Grade Level scores instantly. Scores update live as you type.
What Is the Flesch Reading Ease Score
The Flesch Reading Ease score is a numerical index developed by Rudolf Flesch in 1948 that estimates how easy or difficult a piece of English text is to read. Scores range from 0 to 100. Higher scores indicate easier text. The formula is based on two factors: the average number of words per sentence and the average number of syllables per word.
Flesch Reading Ease = 206.835 − 1.015 × (words / sentences) − 84.6 × (syllables / words)
Scores above 60 are considered standard or easier, suitable for general audiences. Scores below 30 are considered very difficult and are typical of academic journals, legal documents, and technical manuals. Most web content performs best between 60 and 80.
What Is the Flesch-Kincaid Grade Level
The Flesch-Kincaid Grade Level translates the same underlying statistics into a US school grade equivalent. A grade level of 8 means the text is appropriate for an 8th grader (age 13–14). A grade level of 12 corresponds to a high school senior. Grade levels above 16 indicate post-graduate complexity.
FK Grade Level = 0.39 × (words / sentences) + 11.8 × (syllables / words) − 15.59
For most blog posts, marketing copy, and general web content, a grade level of 6–9 is considered optimal. Academic papers and legal writing typically score between 12 and 18.
How to Improve Your Readability Score
The two levers for improving readability are sentence length and word complexity. To improve your score:
- Break long sentences into two shorter sentences.
- Replace multi-syllable words with simpler synonyms where meaning is preserved.
- Avoid stacking noun phrases (e.g. "information retrieval system implementation" → "how to build a search system").
- Use active voice — active constructions tend to be shorter and more direct.
- Aim for sentences under 20 words on average for general web audiences.
How the Readability Checker Works
Paste your text into the input area and the scores update in real time. The two large score tiles at the top show your Flesch Reading Ease score (0–100) and Flesch-Kincaid Grade Level. Below them, a plain- English interpretation panel names your current readability band — Very Easy, Easy, Fairly Easy, Standard, Fairly Difficult, Difficult, or Very Difficult — with a one-sentence description of what that band means for your audience.
Five supporting stat tiles show the raw inputs the formulas use: word count, sentence count, syllable count, average words per sentence, and average syllables per word. These help you understand exactly which factor is driving your current score.
The Flesch Reading Ease scale below the stats displays all seven bands (90–100 Very Easy → 0–30 Very Difficult) as a reference table. The row matching your current score is highlighted in the active band colour, so you can immediately see where your text sits in context of the full range. Use the Clear button to reset the input and all scores.
Limitations of Automated Readability Scores
Flesch and Flesch-Kincaid scores are mechanical approximations. They do not account for conceptual difficulty, the reader's background knowledge, sentence structure complexity beyond length, or vocabulary familiarity. A sentence of short, obscure words can score as "easy" while a sentence of long but familiar words scores as "difficult." Use these scores as a directional signal, not a definitive verdict.
For best results, pair readability analysis with keyword density checking and a manual read-through. The word counter can help you verify total length and speaking time for presentations. For sentence-level analysis with a variety score and highlight mode, use the sentence counter. Read our guide on what is a good readability score and ideal sentence length for readability.
Readability Checker FAQ
Common questions about Flesch Reading Ease and Flesch-Kincaid Grade Level.
A readability score is a numerical estimate of how easy or difficult a piece of text is to read. TitleCasePro's readability checker uses the Flesch Reading Ease score (0–100, higher is easier) and the Flesch-Kincaid Grade Level (US school grade equivalent).
For most web content and blog posts, a Flesch Reading Ease score of 60–70 is considered good (roughly 8th grade level). Scores above 80 are very easy (grade 6). Scores below 30 are very difficult (graduate level), typical of academic papers and legal documents.
The Flesch-Kincaid Grade Level translates the same readability formula into a US school grade equivalent. A grade of 8 means the text is appropriate for an 8th grader. A grade of 12 corresponds to a high school senior. Most general web content targets a grade level between 6 and 9.
To improve readability: break long sentences into shorter ones (aim for under 20 words on average), replace multi-syllable words with simpler synonyms, use active voice instead of passive, and avoid stacking noun phrases. The two main levers are sentence length and word complexity.
Yes — completely free, no signup, no character limits. The tool runs entirely in your browser and updates your score in real time as you type or paste text.
Most successful blog posts score between 60–70 on the Flesch Reading Ease scale (roughly grade 8–9). Marketing copy and landing pages often target 70–80 for maximum accessibility. Academic or technical content may score lower and that is expected.
Readability scores are mechanical approximations — they only measure sentence length and word syllable count. They do not account for conceptual difficulty, vocabulary familiarity, or sentence structure complexity. Use them as a directional signal, not a definitive verdict.