Bookmarklet code to calculate Word Count, Estimated Reading Time and Readability Level (Flesch-Kincaid Grade Level)

ReadabilityLevel.js

// Code generated by ChatGPT
javascript:function estimateReadability() {
    const wordsPerMinute = 200;

    // Function to get word count from text
    const getWordCount = text => text ? text.split(/\s+/).length : 0;

    // Function to calculate readability level
    const getReadabilityLevel = (wordCount, sentenceCount, syllableCount) => {
        const averageWordsPerSentence = wordCount / sentenceCount;
        const averageSyllablesPerWord = syllableCount / wordCount;
        return 0.39 * averageWordsPerSentence + 11.8 * averageSyllablesPerWord - 15.59;
    };

    // Function to get text from selection or entire article
    const getText = () => window.getSelection().toString().trim() || document.body.innerText.trim();

    // Get the text and word count
    const text = getText();
    const wordCount = getWordCount(text);

    // Calculate reading time
    const readingTime = Math.ceil(wordCount / wordsPerMinute);

    // Count sentences and syllables for readability calculation
    const sentences = text.split(/[.!?]+/).length;
    const syllables = text.split(/[aeiouy]+/i).length - 1;

    // Calculate readability level
    const readabilityLevel = getReadabilityLevel(wordCount, sentences, syllables);

    // Show alert with information
    alert(`Word Count: ${wordCount}\nReading Time: ${readingTime} min\nReadability Level (Flesch-Kincaid Grade Level): ${readabilityLevel.toFixed(2)}`);
}

// Call the function to estimate readability
estimateReadability();