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Readability Score

Calculate Flesch-Kincaid Reading Ease, Grade Level, Gunning Fog Index, and SMOG score.

Enter text above to see readability scores

About Readability Score

Readability Score is a free online text utility that lets you calculate flesch-kincaid reading ease, grade level, gunning fog index, and smog score instantly in your browser. Writers, editors, students, and content creators use this tool daily to save time on repetitive text manipulation tasks. No data is sent to any server — everything is processed locally on your device.

How to Use

Paste your text Enter or paste the text you want to process into the input field. There's no length limit for most operations.

Choose your options Select any relevant options or modes to control how your text will be transformed.

Process the text Click the action button to transform your text. Results appear instantly in the output area.

Copy the result Click the Copy button to copy the transformed text to your clipboard, ready to paste anywhere.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use Readability Score?

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Save Hours of Manual Editing Readability Score automates tedious text tasks that would take minutes or hours to do by hand. Process thousands of lines in a single click.

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Complete Privacy Your text is processed entirely in your browser. Nothing is sent to any server, stored, or logged. Close the tab and your data is gone.

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Copy-Paste Friendly Designed for the real workflow: paste your text, transform it, copy the result. No account required, no file uploads, no unnecessary steps.

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Works with Any Language Full Unicode support means Readability Score handles English, Chinese, Arabic, emoji, and any other language or script correctly.

Frequently Asked Questions

Flesch Reading Ease scores from 0–100. Higher = easier to read. 60–70 is plain English (standard for the web). Below 30 is academic/technical. Above 70 is easily understood by most adults. Calculated from average sentence length and average syllables per word.

FK Grade Level maps text to US school grade levels. Grade 8 means the average 8th grader can understand it. Most newspapers target grade 8–12. Web content should aim for grade 8 or lower for maximum accessibility. Grade 12+ is college-level text.

The Fog Index estimates years of formal education needed to understand the text on first reading. It penalizes sentences with many long words (3+ syllables). Values under 12 are accessible; over 18 is academic. Most professional writing targets 12–16.