Sentence counter

What this counter reports

Most tools that count sentences hand you one number and stop. A number on its own tells you almost nothing: 40 sentences could be a crisp two-page memo or an unreadable wall where every sentence is 38 words long. What you actually want to know is the shape of the writing, so this works as a sentence length checker as well as a counter.

• Sentences and words — the totals, updated on every keystroke.
• Average sentence length — words divided by sentences. The single most useful readability number you can get without a formula.
• Median sentence length — half your sentences are shorter than this. When the median sits far below the average, one monster sentence is dragging the mean upward, and the median is the honest figure.
• Longest and shortest — both quoted back verbatim, with a control that selects that sentence in the text box so you can see it in context and start editing immediately.
• Length distribution — how many sentences fall in each band, from 1–5 words up to 41 and over. A single tall bar means every sentence is the same length, which is the thing readers experience as monotony without being able to name it.
• Run-on flags — every sentence at or above your threshold, defaulting to 40 words, listed with a jump-to control. Move the threshold if your field expects longer sentences; academic and legal prose legitimately runs longer than web copy.
• Sentences over 25 words — a softer warning band. One or two are fine. A third of the document is a problem.

How sentences are detected, and where it stops guessing

Splitting on every full stop is what makes cheap counters wrong. “Dr. Alvarez landed in the U.S.A. yesterday at 3 p.m. and went straight to the lab” is one sentence; a naive splitter reports four. This counter treats a full stop as a sentence boundary only after a series of explicit checks, and it shows you every boundary it suppressed, so the number is auditable instead of magic.

• Titles and honorifics — Mr., Mrs., Ms., Dr., Prof., St., Sgt., Gov., Rev. and about forty more never end a sentence, because a name always follows.
• Dotted abbreviations — U.S.A., p.m., a.m., Ph.D., e.g., i.e. Any token of the form letter-dot-letter-dot is treated as an abbreviation when the next word is lower-case, and as a sentence end when the next word is capitalised. That is what separates “I flew to the U.S.A. yesterday” (one sentence) from “I flew to the U.S.A. Yesterday was long” (two).
• Ambiguous abbreviations — etc., et al., Inc., Ltd., Fig., Vol., Jan., Wed., Ave. These genuinely can end a sentence, so the same capitalisation test decides.
• Initials — J. R. R. Tolkien is one name, not three sentences.
• Decimals, versions and domains — 3.14, v2.1 and example.com contain full stops that are not followed by a space, so they are never boundaries.
• Ellipses — “She paused… then kept going” stays one sentence; “She paused… Then she left” becomes two.
• Quoted dialogue — “Stop!” he said is one sentence. A closing quote followed by a lower-case word is an attribution, not a new sentence.
• List markers — a line beginning “1.” or “a.” is a bullet, not the end of a sentence.
• Blank lines — a heading or a bullet with no full stop still counts as one sentence, because a paragraph break ends whatever came before it.

Two things it deliberately does not do. It does not resolve an abbreviation that genuinely ends a sentence and is followed by a proper noun — “I moved to the U.S. Sarah stayed” and “the U.S. Senate” are the same pattern, and no rule can separate them without understanding the words. And it does not treat a single line break as a boundary, because hard-wrapped text would fall apart. Both are visible in the suppressed-boundaries list, so you can see exactly which decisions were made. Our word counter uses a simpler split and says so; this page is the one to trust when the sentence number matters.

What counts as a good average sentence length

There is no universal answer, but there are useful bands. Web copy, product writing and email land well between 12 and 18 words. General non-fiction and journalism sit around 15 to 20. Academic and technical writing runs 20 to 25 and readers accept it because they came for density. Above 25 as an average, comprehension starts dropping for everyone, including experts — they simply blame themselves for it rather than the writer.

The average is only half the story. A document averaging 17 words per sentence where every single sentence is 16, 17 or 18 words long reads like a metronome. The same average built from sentences of 4, 31, 9 and 24 words reads like a person talking. That is what the distribution chart is for: you want several bars with weight in them, not one.

Run-on sentences, and what actually counts as one

Strictly, a run-on is a grammatical fault: two independent clauses joined with no conjunction and no punctuation (“I finished the draft it needs work”). A comma splice is its close relative. Neither one is about length — a run-on can be six words long.

In practice, almost nobody searching for a run-on sentence checker means the technical definition. They mean “this sentence has gone on too long and I have lost the thread of it,” which is a length-and-clause problem. That is what the 40-word flag finds. When a sentence trips it, read it aloud: if you run out of breath, or if you have to re-read to find the subject, split it at the nearest conjunction. Sentences over 40 words usually contain two or three good sentences waiting to be separated, and the fix is almost always a full stop where the “and” or the “which” currently sits.

Counting sentences in something you dictated

Spoken drafts have a distinctive signature: very few sentences, very high average length. People speak in long chains joined by “and” and “so” because speech has intonation to carry the structure that punctuation carries in text. Run a raw transcript through this counter and you will often see an average above 35 with almost everything in the 41+ band.

That is not a reason to stop dictating — it is the fastest way to get a first draft — it is a reason to run one editing pass specifically for sentence boundaries. If your text still has timestamps or speaker labels in it, put it through the transcript cleaner first, and use the text cleaner for stray line breaks and filler, so the counter sees prose rather than formatting.

Where VoiceSnap Pro fits

VoiceSnap Pro is a dictation app for macOS and Windows. Hold one keyboard shortcut, speak, and punctuated text appears in whatever field your cursor is already in — the email, the doc, the ticket, the pull request. It adds sentence punctuation and paragraph breaks as it transcribes, which is precisely the work that makes a raw transcript unreadable when it is missing, and it saves every dictation to a searchable notes library. It is a one-time $39 purchase, not a subscription.

It has not shipped yet. Join the waitlist for one email on release day, or try the browser voice typing tool to see how dictated text reads before you edit it.

Questions people ask

Is my text uploaded anywhere?

No. The counter is JavaScript running in your tab. There is no server call, nothing is written to disk, and closing the tab discards everything.

Why does my word processor report a different sentence count?

Because it uses different tie-breaking rules — usually simpler ones. Most built-in counters split on every full stop, so abbreviations, initials and decimal numbers push their number up. If the two counts differ, check the suppressed-boundaries list on this page; it names every full stop that was not treated as a sentence end and why.

Does it handle languages other than English?

Sentence splitting works for any language that ends sentences with . ! ? or … and separates words with spaces, including accented and non-Latin alphabets. The abbreviation list is English, so “Abb.” in German or “p. ej.” in Spanish may split where they should not. Languages written without spaces, such as Chinese and Japanese, cannot be word-counted this way at all.

Can I change the run-on threshold?

Yes — the field next to the buttons accepts anything from 15 to 120 words. Journalists often set it to 30, academic writers to 50.

Does a bullet list count as sentences?

Each bullet counts as one sentence if it is separated by a blank line or ends with punctuation. A tight list with single line breaks and no full stops counts as one sentence, because there is no reliable way to tell that apart from a hard-wrapped paragraph.

Is there a length limit?

No hard cap. Everything is recomputed on each keystroke, so a book-length manuscript may feel slightly less snappy while you type. Essays, articles, scripts and transcripts are instant.