Readability Checker
Paste text and get real, calculated readability scores using the published Flesch Reading Ease and Flesch-Kincaid Grade Level formulas, shown on this page with the counts behind them. Scores describe sentence and word length only — they cannot judge accuracy, usefulness or tone.
These formulas measure sentence and word length only. They cannot judge accuracy, usefulness or tone.
What this tool cannot do
Formula scores only, based on sentence length and syllable counts. They do not measure whether the content is correct, helpful or well structured.
How to use it
- Paste your text (at least a few sentences for a meaningful score).
- Read the scores and the counts behind them.
- Shorten long sentences and simplify long words if the text is harder than your audience needs.
Frequently asked questions
What do the formulas actually measure?
Flesch Reading Ease: 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words). Higher is easier. Flesch-Kincaid Grade: 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59, expressed as a school grade level.
What score should I aim for?
For a general audience, Reading Ease around 60–70 (plain English) is a common target. Technical audiences may need denser text, and that is fine.