Dale-Chall Readability Score Calculator

This free Dale-Chall Readability Score Calculator lets you calculate Dale-Chall Readability Score without installing anything. Use the tool below and see your result straight away.

How to use the Dale-Chall Readability Score Calculator

Type or paste your input.
Click “Calculate Dale-Chall Readability”.
Your result shows on the page.

Why use this Dale-Chall Readability Score Calculator?

The Dale-Chall Readability Score Calculator is handy for school, work and everyday decisions. It is free, easy to use and works on any device.

Skip manual maths and avoid simple mistakes
Get a result as soon as you enter your numbers
Try different values as often as you like

Dale-Chall Readability Score Calculator – frequently asked questions

Is the Dale-Chall Readability Score Calculator free to use?

Yes, it is free. You can use the Dale-Chall Readability Score Calculator as often as you like without signing up.

Do I need to install anything?

No. It runs in your web browser on a phone, tablet or computer.

Is my data safe when I use the Dale-Chall Readability Score Calculator?

The tool runs in your browser, so what you enter is processed on your own device and is not sent to our servers.

How accurate is the Dale-Chall Readability Score Calculator?

It follows standard formulas and shows the result on the page. For important choices, such as money, health or exams, please double-check the result with an official source or a professional.

More free Calculators

Browse all Calculators on Ilmhunt, or see all free online tools.

Embed this tool on your website — free

Copy the code below to add this working tool to your own page. A small credit link stays with it — that’s all we ask.

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    &lt;h1&gt;Dale-Chall Readability Calculator&lt;/h1&gt;
    &lt;textarea id=&quot;inputText&quot; placeholder=&quot;Type in or copy and paste your text here...&quot;&gt;&lt;/textarea&gt;
    &lt;div class=&quot;stats&quot;&gt;
        &lt;div&gt;Characters: &lt;span id=&quot;charCount&quot;&gt;0&lt;/span&gt;&lt;/div&gt;
        &lt;div&gt;Words: &lt;span id=&quot;wordCount&quot;&gt;0&lt;/span&gt;&lt;/div&gt;
        &lt;div&gt;Sentences: &lt;span id=&quot;sentenceCount&quot;&gt;0&lt;/span&gt;&lt;/div&gt;
        &lt;div&gt;Syllables: &lt;span id=&quot;syllableCount&quot;&gt;0&lt;/span&gt;&lt;/div&gt;
    &lt;/div&gt;
    &lt;button onclick=&quot;calculateDaleChall()&quot;&gt;Calculate Dale-Chall Readability&lt;/button&gt;
    &lt;div class=&quot;results&quot;&gt;
        &lt;h3&gt;Results:&lt;/h3&gt;
        &lt;p&gt;Dale-Chall Readability Score: &lt;span id=&quot;daleChallScore&quot;&gt;0&lt;/span&gt;&lt;/p&gt;
        &lt;p&gt;Reading Level: &lt;span id=&quot;readingLevel&quot;&gt;0&lt;/span&gt;&lt;/p&gt;
        &lt;p&gt;Reading Note: &lt;span id=&quot;readingNote&quot;&gt;0&lt;/span&gt;&lt;/p&gt;
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&lt;/div&gt;

&lt;script&gt;
    // List of Dale-Chall familiar words (simplified for demonstration)
    const daleChallFamiliarWords = new Set([
        'a', 'about', 'after', 'all', 'also', 'an', 'and', 'are', 'as', 'at', 'be', 'because', 'been', 'but', 'by', 'can', 'come', 'could', 'day', 'do', 'even', 'first', 'for', 'from', 'get', 'give', 'go', 'have', 'he', 'her', 'here', 'him', 'his', 'how', 'I', 'if', 'in', 'into', 'is', 'it', 'its', 'just', 'know', 'like', 'look', 'make', 'man', 'many', 'me', 'more', 'my', 'new', 'no', 'not', 'now', 'of', 'on', 'one', 'only', 'or', 'other', 'our', 'out', 'over', 'people', 'say', 'see', 'she', 'so', 'some', 'take', 'than', 'that', 'the', 'their', 'them', 'then', 'there', 'these', 'they', 'thing', 'think', 'this', 'those', 'time', 'to', 'two', 'up', 'use', 'very', 'want', 'way', 'we', 'well', 'what', 'when', 'which', 'who', 'will', 'with', 'would', 'year', 'you', 'your'
    ]);

    function countCharacters(text) {
        return text.replace(/\s/g, '').length; // Exclude whitespace
    }

    function countWords(text) {
        return text.split(/\s+/).filter(word =&gt; word.length &gt; 0).length;
    }

    function countSentences(text) {
        return text.split(/[.!?]+/).filter(sentence =&gt; sentence.length &gt; 0).length;
    }

    function countSyllables(word) {
        word = word.toLowerCase();
        if (word.length &lt;= 3) return 1;
        const syllables = word.match(/[aeiouy]{1,2}/g);
        return syllables ? syllables.length : 0;
    }

    function countDifficultWords(text) {
        const words = text.toLowerCase().split(/\s+/);
        return words.filter(word =&gt; !daleChallFamiliarWords.has(word)).length;
    }

    function calculateDaleChall() {
        const text = document.getElementById('inputText').value;

        // Calculate basic stats
        const characters = countCharacters(text);
        const words = countWords(text);
        const sentences = countSentences(text);
        const syllables = text.split(/\s+/).reduce((acc, word) =&gt; acc + countSyllables(word), 0);
        const difficultWords = countDifficultWords(text);

        // Update stats display
        document.getElementById('charCount').textContent = characters;
        document.getElementById('wordCount').textContent = words;
        document.getElementById('sentenceCount').textContent = sentences;
        document.getElementById('syllableCount').textContent = syllables;

        // Calculate Dale-Chall Readability Score
        const daleChallScore = calculateDaleChallScore(words, difficultWords, sentences);

        // Update results display
        document.getElementById('daleChallScore').textContent = daleChallScore.toFixed(2);
        document.getElementById('readingLevel').textContent = getReadingLevel(daleChallScore);
        document.getElementById('readingNote').textContent = getReadingNote(daleChallScore);
    }

    function calculateDaleChallScore(words, difficultWords, sentences) {
        if (words === 0 || sentences === 0) return 0;
        const percentDifficultWords = (difficultWords / words) * 100;
        const averageSentenceLength = words / sentences;
        return (0.1579 * percentDifficultWords) + (0.0496 * averageSentenceLength);
    }

    function getReadingLevel(daleChallScore) {
        if (daleChallScore &lt;= 4.9) return &quot;4th grade or lower&quot;;
        if (daleChallScore &lt;= 5.9) return &quot;5th or 6th grade&quot;;
        if (daleChallScore &lt;= 6.9) return &quot;7th or 8th grade&quot;;
        if (daleChallScore &lt;= 7.9) return &quot;9th or 10th grade&quot;;
        if (daleChallScore &lt;= 8.9) return &quot;11th or 12th grade&quot;;
        return &quot;13th to college&quot;;
    }

    function getReadingNote(daleChallScore) {
        if (daleChallScore &lt;= 4.9) return &quot;Very easy to read.&quot;;
        if (daleChallScore &lt;= 5.9) return &quot;Easy to read.&quot;;
        if (daleChallScore &lt;= 6.9) return &quot;Moderately easy to read.&quot;;
        if (daleChallScore &lt;= 7.9) return &quot;Fairly difficult to read.&quot;;
        if (daleChallScore &lt;= 8.9) return &quot;Difficult to read.&quot;;
        return &quot;Very difficult to read.&quot;;
    }
&lt;/script&gt;

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<p><a href="https://ilmhunt.com/dale-chall-readability-score-calculator/" target="_blank" rel="noopener">Dale-Chall Readability Score Calculator</a> by <a href="https://ilmhunt.com/" target="_blank" rel="noopener">IlmHunt</a> — free online tools</p>