# Free Sentence Counter

> A sentence counter tells you how many sentences are in a passage by splitting on full stops, question marks, and exclamation points. Humanit’s free sentence counter also reports your average sentence length — a key readability signal — and runs entirely in your browser with nothing uploaded.

**URL:** https://humanit.app/tools/sentence-counter  ·  **Updated:** May 2026  ·  Humanit

Count sentences instantly and see your average sentence length. Free, unlimited, private — ideal for tightening readability.

## How it works

1. **Paste your text** — Type or paste your text into the sentence counter above.
2. **See results instantly** — The numbers update live as you type — there’s no button to press.
3. **Edit and re-check** — Tweak your text and watch the results change in real time.

## How sentences are counted

The counter splits your text on sentence-ending punctuation — periods, question marks, and exclamation points — and ignores empty fragments. A block of text with no ending punctuation still counts as one sentence, so short notes are never reported as zero.

## Why average sentence length matters

Uniform sentence length is one of the signals AI detectors score on (low “burstiness”). Varied length — mixing short, punchy sentences with longer ones — reads as more human and more engaging. Watching your average and your sentence count helps you spot a passage that has gone flat and monotonous.

## Tighten your writing

Most clear writing averages 15–20 words per sentence. If your average climbs much higher, readers lose the thread; break long sentences in two. The live count lets you edit and immediately see the effect.

## Free, unlimited, and private

The sentence counter is free with no sign-up and no limit on how much text you process. Because it runs entirely in your browser, your text is never sent to a server, stored, or used to train any AI — it never leaves your device. When you’re ready to do more with your writing, Humanit’s AI humanizer and AI detector are one click away.

**Average sentence length, as a readability guide**

| Words per sentence | Reads as | Best for |
| --- | --- | --- |
| 8–11 | Very easy, punchy | Ads, UX copy, social |
| 15–20 | Clear and standard | Most writing |
| 21–25 | Denser | Reports, analysis |
| 25+ | Hard to follow | Trim it down |

## FAQ

**How does it decide where a sentence ends?**

It splits on terminal punctuation — periods, question marks, and exclamation points — and ignores empty fragments, so the count reflects real sentences.

**Does it count a line with no period as a sentence?**

Yes. A block of text with no ending punctuation is counted as one sentence rather than zero, which matches how people read.

**What is a good average sentence length?**

For clear, general-audience writing, 15–20 words per sentence is a good target. Varying the length keeps the writing from sounding flat.

**Is it free and private?**

Yes — free, unlimited, no account, and it runs entirely in your browser so your text is never uploaded.

**Do I need an account?**

No. There’s no sign-up and no install — open the page and start typing.

**Does it work on mobile?**

Yes — it works in any modern browser on phone, tablet, or desktop.

## Related pages

- [Word Counter](https://humanit.app/tools/word-counter) ([markdown](https://humanit.app/tools/word-counter.md))
- [Character Counter](https://humanit.app/tools/character-counter) ([markdown](https://humanit.app/tools/character-counter.md))
- [Paragraph Counter](https://humanit.app/tools/paragraph-counter) ([markdown](https://humanit.app/tools/paragraph-counter.md))
- [Reading Time Calculator](https://humanit.app/tools/reading-time-calculator) ([markdown](https://humanit.app/tools/reading-time-calculator.md))
- [AI Humanizer](https://humanit.app/humanize) — Rewrite AI text to read human. ([markdown](https://humanit.app/humanize.md))
- [AI Detector](https://humanit.app/detect) — Check if text reads as AI-written. ([markdown](https://humanit.app/detect.md))

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- **Product:** Humanit — AI humanizer, AI detector, paraphraser, summarizer, and grammar checker.
- **Free tier:** 1 run with no account, then 5 more free runs on a free account (one-time, they do not reset), up to 1,500 words per run.
- **Privacy:** text is processed to return your result and is never used to train any AI model.
- **Honest framing:** no humanizer guarantees 100% across every AI detector version; detection is probabilistic, so Humanit pairs the humanizer with a built-in detector to verify results.
- **iOS app:** https://apps.apple.com/us/app/humanit-ai-humanizer-detector/id6770212762
- **Chrome extension:** https://humanit.app/extension (store: https://chromewebstore.google.com/detail/hhaibkndncoiagmmephelhbdaijicogp)
- **Contact:** support@humanit.app

_Last updated: June 2026._