Sentence Counter is a precise online tool that instantly counts the number of sentences in any text using intelligent punctuation detection, while also providing comprehensive text analysis including word count, character count, paragraph count, and estimated reading time. Counting sentences manually is a task that sounds simple but quickly becomes tedious and error-prone when applied to real-world documents. A student proofreading an essay needs to verify they have met the minimum sentence count requirement. An editor evaluating a manuscript needs to analyze sentence density and variety to assess readability. A content writer optimizing an article for SEO needs to understand the relationship between sentence count and reading level. A language teacher assessing student writing needs to measure sentence production as a metric of writing proficiency. In every one of these scenarios, manual counting is not just slow but fundamentally unreliable because sentence boundaries are not always obvious. Abbreviations like Mr., Dr., and Inc. contain periods that are not sentence endings. Decimal numbers like 3.14 include periods within numbers. URLs and email addresses contain dots that could be mistaken for sentence terminators. This sentence counter handles all of these edge cases correctly using intelligent punctuation detection that distinguishes between sentence-ending periods and periods within abbreviations, numbers, and other non-sentence contexts. The tool goes beyond simple sentence counting by providing a complete text analysis dashboard. Alongside the sentence count, you see the total word count, character count with and without spaces, paragraph count, and estimated reading time based on an average reading speed. This comprehensive view gives you a full picture of your text structure and complexity in a single glance. The analysis happens instantly as you type or paste text, with no button clicks required and no delay in results. All processing occurs entirely within your browser, ensuring your text never leaves your device. This is essential when working with confidential documents, legal texts, medical records, or any content that cannot be uploaded to external servers. Compared to manually counting sentences or using basic text editors that only show word count, this tool provides accurate, instant, and comprehensive analysis with complete privacy. The intelligent punctuation detection algorithm is the core technology that sets this tool apart from simple character-counting utilities. By maintaining a list of common abbreviations and recognizing patterns like decimal numbers and URLs, the algorithm avoids the false positives that plague simpler approaches. The tool also handles multiple sentence-ending punctuation marks correctly, so text ending with exclamation points, question marks, and periods are all counted as sentence terminators. For editors and proofreaders, the combination of sentence count with word count and reading time estimates provides a complete picture of document complexity that helps assess whether content is appropriate for its intended audience. The instant, real-time analysis means you can paste text and get results immediately without clicking any buttons. For ESL teachers and language instructors, the sentence count provides a quantitative measure of student writing progress that complements qualitative assessment of writing quality. Tracking sentence count over time reveals whether students are developing the ability to construct more complex sentences and express ideas with greater sophistication. The reading time estimate based on sentence and word count helps educators determine whether content is appropriately challenging for their students level. The tool's ability to handle edge cases like abbreviations and decimal numbers means it provides reliable counts even for academic and technical text that contains many potential false positives for simpler counting approaches.