Readability Checker: How It Works and How to Use It
Check how easy your writing is to read with the Flesch Reading Ease score and estimated US grade level.
Like every tool on UltimateTools, it runs instantly in your browser, updates as you type, and doesn't require an account or sign-up to use.
What it calculates
Check your writing's reading ease and grade level.
Whether you think of it as a "readability checker" tool, a "flesch reading ease or reading grade level calculator" tool, or simply the Readability Checker, this page covers the same calculation.
You can find it at any time on the Readability Checker page, where the calculator sits above a full explanation of the method it uses.
Tips for an accurate result
Re-check readability after editing, not just before — edits meant to simplify text sometimes accidentally make it more complex.
Don't over-optimize for a score at the expense of accuracy or nuance — a technically simpler sentence that's less precise isn't actually an improvement.
Keep a style consistent across a document; wildly varying sentence complexity can hurt flow even if the average score looks fine.
Shorter sentences and simpler words are the two levers that move most readability scores the most — start there if a score is low.
Related tools worth trying
If you found the Readability Checker useful, Reading Time Calculator, Speech Time Calculator, Tip Calculator cover closely related ground and are worth a look next.