Gunning Fog Index Calculator - Free, Instant, In Your Browser
Paste text below (at least one full sentence) to calculate its Gunning Fog index, another estimate of years of education needed to understand it.
How to use Gunning Fog Index Calculator
- 1Paste your text or data into the input box above.
- 2Gunning Fog Index Calculator runs instantly, right in your browser.
- 3Copy the result or use it directly.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
What's the formula?
Index = 0.4 × [(words/sentences) + 100 × (complex words/words)], where complex words have 3 or more syllables.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.