Readability Score Checker

How to Use This Readability Score Checker

Paste your text into the editor above, or type directly. All seven readability scores update in real time as you write. The tool highlights hard-to-read sentences in yellow and very-hard sentences in red, so you can see exactly which parts of your writing need simplification. Passive voice constructions are marked in teal, and overused adverbs appear in purple.

Use the target audience selector in the toolbar to set a goal. The progress bar shows how close your text is to the recommended grade level for your chosen audience. For general web content, aim for 7th to 8th grade level. Marketing copy and patient-facing healthcare documents should target an even lower reading level.

Click on any highlighted complex word to see a simpler alternative. Hover over a highlighted sentence in the breakdown to understand why it scored poorly. The sentence breakdown table below the editor lists every sentence with its individual difficulty rating, so you can quickly jump to the worst offenders.

Understanding Readability Scores

Readability scores estimate how difficult a piece of text is to understand. They use mathematical formulas based on measurable factors like sentence length, word length, syllable count, and vocabulary complexity. Different formulas emphasize different factors, which is why this tool calculates seven of them to give you a complete picture.

The Flesch Reading Ease score ranges from 0 to 100, where higher is easier. A score of 60 to 70 is considered ideal for general audiences. The Flesch-Kincaid Grade Level converts the same inputs into a U.S. school grade level. A score of 8 means an average 8th grader could understand the text.

The Gunning Fog Index looks specifically at complex words (three or more syllables) and sentence length. It tends to produce higher numbers than Flesch-Kincaid, so a Fog score of 12 roughly corresponds to a high school senior reading level.

Coleman-Liau and ARI are character-based formulas that do not require syllable counting, making them more reliable for automated analysis. SMOG is considered the most accurate formula for healthcare materials and counts polysyllabic words specifically. Dale-Chall uses a list of 3,000 words that are familiar to most 4th graders, and anything not on that list is considered difficult.

What Grade Level Should You Target?

The answer depends on your audience. Here are the recommended levels by use case:

• Marketing copy and emails: 6th to 7th grade. Shorter sentences, common words, direct calls to action.
• Blog posts and web content: 7th to 8th grade. The level used by most major publications, including the New York Times.
• Business reports: 9th to 10th grade. Some technical vocabulary is acceptable if the audience expects it.
• Healthcare patient materials: 5th to 6th grade. The American Medical Association recommends this level.
• Academic papers: 12th grade and above. Complex vocabulary and sentence structure are expected.

Remember that a lower grade level does not mean dumbing down your content. It means communicating the same ideas more clearly. Hemingway wrote at a 4th-grade level and won the Nobel Prize.

Tips for Improving Readability

If your score is higher than your target, here are practical steps to simplify your writing:

• Shorten sentences. Break long sentences at natural pause points. Aim for 15 to 20 words per sentence on average.
• Use simpler words. Replace "utilize" with "use", "commence" with "start", "facilitate" with "help". This tool highlights complex words and suggests alternatives.
• Eliminate passive voice. "The report was written by the team" becomes "The team wrote the report." Active voice is shorter and clearer.
• Cut unnecessary adverbs. "She ran quickly" becomes "She sprinted." Strong verbs make adverbs redundant.
• One idea per sentence. If a sentence contains "and", "but", or "however" connecting two complete thoughts, consider splitting it.

How the Algorithms Work Behind the Scenes

All analysis runs entirely in your browser. The tool splits your text into sentences, tokenizes words, counts syllables using a heuristic algorithm, and then applies each formula. The Dale-Chall score uses an embedded list of 3,000 familiar words to classify vocabulary difficulty. Sentence difficulty is evaluated by applying the Flesch-Kincaid formula at the individual sentence level, and color-coding is based on the resulting grade.

Since everything happens locally, your text is never sent to a server. You can safely analyze confidential documents, drafts, academic work, and business communications without any privacy concern.

Want to learn more about readability and how to write content that anyone can understand? Read our complete guide to readability scores for a deeper dive into the science behind these formulas.