# Readability Check

> Free readability calculator. Paste any text and get instant scores across 6 formulas (Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) with per-sentence difficulty highlighting in real time.

## What this tool does

Readability Check measures how hard a piece of writing is to read. It computes six standard readability formulas, returns the equivalent US grade level, and highlights individual sentences that are dragging the score down so writers can see exactly what to rewrite.

## Key pages

- [Home — paste text, get readability score](https://readabilitycheck.com/)
- [Flesch Reading Ease calculator](https://readabilitycheck.com/flesch-reading-ease/)
- [Flesch-Kincaid Grade Level calculator](https://readabilitycheck.com/flesch-kincaid-calculator/)
- [Gunning Fog Index calculator](https://readabilitycheck.com/gunning-fog-calculator/)
- [Coleman-Liau Index calculator](https://readabilitycheck.com/coleman-liau-calculator/)
- [Automated Readability Index calculator](https://readabilitycheck.com/ari-calculator/)
- [Reading level calculator (all six formulas)](https://readabilitycheck.com/reading-level-calculator/)
- [How to improve your readability score](https://readabilitycheck.com/improve-readability-score/)
- [Readability formulas explained](https://readabilitycheck.com/readability-formulas/)
- [Embed the calculator on your site](https://readabilitycheck.com/embed/)

## About

Readability Check is a free tool from Boringhaus. No login, no tracking, no API limits. The full calculation runs in your browser.