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Readability Formulas
What it is
Readability Formulas offers free tools for scoring English text and estimating the reader grade level and age needed to understand it. Its Readability Scoring System includes formulas such as Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Dale-Chall, Spache, FORCAST, Fry, and Raygor. Users can paste text or provide .txt, .docx, .rtf, .html, and .pdf files. Text Statistics reports measures including syllable count, average sentence length, abbreviations, proper nouns, and passive voice. The beta Robert Gunning Editor helps identify difficult words and wordiness, with tools for editing phrases, nominalizations, fuzzy words, and weak verbs. Batch Processing, also marked beta, scores multiple texts with one or more formulas. A Google Chrome and Microsoft Edge extension can score highlighted website text, open the editor, and show word statistics. The privacy policy says text processing runs locally in the user’s browser and submitted text is not stored on a server or accessible to the site. The Synonym Finder connects securely to Datamuse’s API and can transmit one word at a time.
For and against
For
- Offers several established readability formulas.
- Accepts pasted text and five file formats.
- Reports sentence, syllable, and voice statistics.
- Browser extension scores highlighted website text.
- States submitted text is processed locally.
Against
- Scoring system is for English-language text.
- Editor is marked beta.
- Batch Processing is marked beta.
- Synonym Finder can transmit a word to Datamuse.
The verdict
Readability Formulas combines readability scores, text statistics, and editing tools, with a browser extension for selected text. Note the English-language scope and beta status of the editor and batch feature.
Who it suits
The tools may suit writers, editors, educators, marketing professionals, healthcare providers, and government agencies. They are for people who want readability measures or text-editing support for English-language material.
Plans and prices
Free online readability tools
Free calculators and Readability Scoring System; current pricing page not found
Read 2 Oct 2026 · readabilityformulas.com
On the record
- Batch processing
- Batch Processing is marked beta and can score multiple texts using one or more readability formulas.readabilityformulas.com · read 2 Oct 2026
- Browser extension
- The extension for Google Chrome and Microsoft Edge can score highlighted website text, open the editor, and show word statistics.readabilityformulas.com · read 2 Oct 2026
- Editor
- The beta Robert Gunning Editor helps identify hard words and wordiness, with tools for editing phrases, nominalizations, fuzzy words, weak verbs, and more.readabilityformulas.com · read 2 Oct 2026
- File inputs
- The system accepts .txt, .docx, .rtf, .html, and .pdf files, as well as pasted text.readabilityformulas.com · read 2 Oct 2026
- Formula selection
- The system includes formulas such as Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Dale-Chall, Spache, FORCAST, Fry, and Raygor.readabilityformulas.com · read 2 Oct 2026
- Intended users
- The site names writers and editors, educators, marketing professionals, healthcare providers, and government agencies as users who may benefit.readabilityformulas.com · read 2 Oct 2026
- Privacy
- The privacy policy says text processing runs through local scripts in the user's device browser and submitted text is not stored on a server or accessible to the site.readabilityformulas.com · read 2 Oct 2026
- Purpose
- The site offers free tools to score text and identify the reading and grade levels readers need to understand it.readabilityformulas.com · read 2 Oct 2026
- Readability scoring
- The Readability Scoring System scores English-language text using popular readability formulas and estimates reader grade level and age.readabilityformulas.com · read 2 Oct 2026
- Support
- The site asks users to contact it about difficulties, bugs, mistakes, or scoring discrepancies.readabilityformulas.com · read 2 Oct 2026
- Synonym Finder
- The privacy policy says the Synonym Finder connects securely to Datamuse's API and can transmit one word at a time.readabilityformulas.com · read 2 Oct 2026
- Text statistics
- Text Statistics reports measures including syllable count, average sentence length, abbreviations, proper nouns, and passive voice.readabilityformulas.com · read 2 Oct 2026
