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    Sentence Counter & Rhythm Analyzer

    Count sentences, measure average length, flag sentences over 30 words, and score your writing rhythm — instantly and privately.

    More than a counter. See which sentences are hurting readability.

    Sentences
    0
    Words
    0
    Characters
    0
    Paragraphs
    0

    Autosaved locally · text stays in your browser

    ParagraphsMeasured
    0
    LinesMeasured
    0
    Reading timeEstimate
    —
    Speaking timeEstimate
    —

    Where your text fits

    Measured characters · 0

    • X postFits
      0 / 280280 left
    • SMSFits
      0 / 160160 left
    • Meta titleFits
      0 / 60 rec.60 left
    • Meta descriptionFits
      0 / 160 rec.160 left
    • YouTube titleFits
      0 / 100100 left
    • LinkedIn postFits
      0 / 3,0003,000 left

    Check your text against common limits

    Reference limits from the publishing registry, measured against your text right now. Set your own limit to replace them.

    X (formerly Twitter) post0 / 280
    280 remainingHard limit
    SMS message0 / 160
    160 remainingHard limit
    Instagram caption0 / 2,200
    2,200 remainingHard limit
    LinkedIn post0 / 3,000
    3,000 remainingHard limit

    Reading & speaking time

    Reading time
    —
    Speaking time
    —
    Estimated pages
    —

    Model · 5.7 characters per word · 250 words per page · 225 wpm reading · 130 wpm speaking

    More text analysis and editing tools
    Letters
    0
    No spaces
    0
    Paragraphs
    0
    Lines
    0
    Reading level
    —

    Derived from the measured word count

    0words
    225 words/min reading
    —reading (est.)
    0words
    130 words/min speaking
    —speaking (est.)
    0words
    250 words/page
    —pages (est.)

    Ranges are modelled, not measured: they show the same assumption applied with a ±10% allowance for style and formatting.

    Estimated AI tokens 0model-based, not exact

    Document shape

    Your sentence map appears here when there is text to measure.

    Your sentence map appears here

    Paste text above and every sentence becomes one measured row, in document order, on a shared scale. No marks are drawn before there is text to measure.

    How the sentence counter works

    The counter is rule-based, not AI. It reads your text in your browser and applies the same fixed rules every time, so the same input always gives the same count.

    • Periods, question marks and exclamation points end a sentence when a space, a line end or the end of the text follows. A run such as "?!" ends only one sentence.
    • Common abbreviations such as Dr., Mr., e.g., U.S. and single initials (J. R. R.) do not end a sentence. Abbreviations that often close a sentence, such as p.m., a.m., etc. and Inc., do end one when the next word starts with a capital letter.
    • Decimals, URLs and email addresses (3.14, example.com) never split a sentence, because no space follows their periods.
    • Ellipses ("..." or "…") followed by a lower-case word are treated as a pause inside the sentence. Followed by a capital letter or the end of the text, they end it.
    • Quotation marks stay with their sentence. In "Is it late?" she asked. the question mark does not split the line, because a lower-case attribution follows.
    • Line breaks always end a sentence. Headings, bullet points and numbered list items each count as one sentence, even without punctuation. Blank lines separate paragraphs.
    • Chinese and Japanese punctuation: the full-width marks 。！？ end a sentence even when no space follows.

    Limitations. This is a documented heuristic, not full linguistic analysis. An abbreviation that is not on the list, a sentence that starts with a lower-case word, or a capitalised name after "p.m." can be miscounted. Thai and other scripts without sentence punctuation are counted by line only.

    Worked example

    Input

    Dr. Lee left at 5 p.m. The bill came to $3.14... was that right? Yes!

    Count

    3 sentences

    1. Dr. Lee left at 5 p.m.
    2. The bill came to $3.14... was that right?
    3. Yes!

    "Dr." is a title, so it does not end anything. "p.m." is followed by the capitalised "The", so it closes the first sentence. The period in "3.14" has no space after it, and the ellipsis is followed by the lower-case "was", so both stay inside the second sentence, which ends at the question mark. "Yes!" is the third.

    FAQ

    Frequently Asked Questions

    What is a good average sentence length?

    For general web writing, 15–20 words per sentence is a common readability target. Journalism and marketing copy often average less; academic and legal writing often runs longer. Variety matters as much as the average: a mix of short and longer sentences is easier to read than a uniform length.

    When is a sentence too long?

    There is no hard rule, but sentences over about 30 words are harder for most readers to follow in one pass. This tool flags every sentence in your text that exceeds 30 words so you can decide whether to split or rewrite it.

    How does the rhythm score work?

    It measures how much your sentence lengths vary (the spread of word counts per sentence). Text that alternates between short and long sentences scores higher; text where every sentence is a similar length scores lower. It describes variety, not quality.

    How are sentences counted?

    Sentences end at periods, question marks and exclamation points followed by a space, a line end or the end of the text, and at the full-width marks 。！？ even with no space. Common abbreviations (Dr., U.S., e.g.), decimals (3.14), URLs and quotation marks do not split a sentence, and an ellipsis followed by a lower-case word stays inside its sentence. Every line break also ends a sentence, so headings and list items count as one each.

    Which numbers on this page are measured and which are estimated?

    Sentences, words, characters, paragraphs, lines and sentence lengths are measured directly from your text. Reading time, speaking time, pages and AI tokens are estimates derived from those counts using stated averages, and are marked as approximate.

    Why Use Our Free Sentence Counter Tool

    Understand Your Writing Style

    Our free online sentence counter reveals important information about your writing style, readability, and text structure. The average English sentence contains 15-20 words, though this varies significantly by genre and purpose. Knowing your sentence count alongside word count helps you calculate average sentence length and optimize your content for your target audience. Simply divide your total word count by sentence count to find your average—a key metric for readability assessment.

    Sentence Length by Content Type

    Academic writing, research papers, and legal documents often feature longer, more complex sentences with multiple clauses and detailed explanations. In contrast, marketing copy, web content, and journalism uses shorter, punchier sentences for better engagement and faster reading. Children's books use very short sentences with simple vocabulary. By monitoring your sentence count, you can intentionally vary sentence length to create rhythm, improve flow, and maintain reader interest throughout your text.

    Readability Formulas and Metrics

    Readability formulas like Flesch-Kincaid, Gunning Fog Index, and SMOG rely heavily on sentence count as a key input for calculating reading level. These formulas combine sentence length with word complexity to determine grade-level readability. Fewer words per sentence generally means easier reading and better comprehension for general audiences. Professional communicators use these metrics to ensure their content matches their audience's reading ability—whether that's elementary school students, general consumers, or academic professionals.

    Optimize Web Content

    Editors and content writers use sentence counts to keep web copy easy to scan, especially on small screens where long sentences wrap over many lines. Our sentence counter helps you identify opportunities to break up dense passages and improve content accessibility across all platforms and devices.

    SnapLetterCount's sentence counter works entirely in your browser with complete privacy protection. No text is sent to external servers, no accounts are required, and your content remains confidential. The tool is completely free and works seamlessly on desktop computers, tablets, and smartphones. Try our free sentence counter now to analyze your text structure, calculate average sentence length, and improve readability instantly for blogs, essays, articles, and professional documents. Combine it with our paragraph counter and character counter for comprehensive text analysis.

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