Welcome to ReadabilityFormulas.com, a free website to help you: 1) score your texts (documents, books, policies, technical materials, etc.) and 2) find the reading level and grade level that readers need to read and comprehend your text.

Our Automatic Readability Checker will analyze your text and calculate the number of sentences, words, syllables, and characters in your sample. Our program takes the output of these numbers and plugs them into seven popular readability formulas. These readability formulas will yield the reading level and grade level of your text and help you determine if your audience can read your materials.

Our free readability formulas include:


Use our Automatic Readability Checker now to score any type of text for any grade level.

View all of our Free Readability Calculators to automatically score your text and get the grade level and reading age.

We offer a handful of articles to help you learn about the pros and cons of using readability formulas.

What Are Readability Formulas?, How Do I Decide which Readability Formula to Use?, How Readability Formulas Work, Readability Guidelines to Calculate Readability Scores, Advantages and Disadvantages of Using Readability Formulas, etc.

See all articles on learning about Readability Formulas

The majority of readability formulas calculate the grade level of a text using syllable count, word count and sentence length. The exceptions are the Spache Readability Formula and the New Dale-Chall Readability Formula. Both of these formulas compare a graded word list with your text and then calculate a U.S. grade level based on the number of difficult words with average sentence length.

Use our free Dale-Chall Readability Calculator to score any type of text for 4th grade and above. Otherwise, use our free Spache Readability Calculator to score any type of text for 4th grade and below.

In addition to the readability text tools above, we have a separate readability calculator called, the Fry Graph and Raygor Graph Text Tool, which will score a sample of your text and visually plot the grade level onto each graph.

The Fry readability formula [ learn more ] measures English texts to provide you with a reading/grade level based on two criteria: 1) the average number of sentences, and 2) syllables per hundred words. We plot these averages onto The Fry Graph to visually show you the grade level of your readers.

Similar to The Fry Graph, The Raygor readability formula [ learn more ] also measures text based on the average number of sentences and letters per hundred words. We plot these two averages on the Raygor Graph to visually show you the reading/grade level of your readers. The Raygor Graph is largely used in secondary education to assess teaching materials and books, whereas The Fry Graph is commonly used on a broader range of texts.

Many writers, professionals and amateurs, face the dilemma of writing materials above the reading level of their readers. The best way to write for your target audience is to learn how to make your writing more readable by removing unnecessary words, using more familiar words, and sticking to a shorter sentence length. We invite you to peruse through our many articles on how to write better. Our authors offer you their best writing tips to help you identify and remedy problem areas in your writing and write in plain English—the preferred writing style for a public readership.

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