Paste your text and get a Flesch reading ease score, the grade level it reads at, and the sentence and word stats behind the number.
Paste at least a few paragraphs, ideally the whole article, and press Calculate. The big number is the Flesch reading ease score, from 0 to 100, with a label and advice next to it. Below it you get the grade level, the average sentence length and the average syllables per word, which tell you where the difficulty comes from. Long sentences: split them. Long words: swap them for shorter ones. Paste again to see the score move.
Most web readers skim, and most of them stop at the first sentence they have to read twice. A score of 60 or more, roughly eighth or ninth grade, is where general audiences stay on the page, and Google's own writing guidance points the same way. Readability is also the cheapest edit you can make: it needs no research and no new content, just shorter sentences and plainer words.
60 to 70 suits most blog posts and product pages. Consumer content can go higher. Technical or academic writing often sits at 30 to 50, and that is fine if the readers expect it.
Cut sentences over 20 words in two, replace three-syllable words where a shorter one means the same, and delete filler openers. Those three changes move most texts ten points.
Not as a direct score, but readers who understand the page stay longer and come back, and Google measures both. Clear text also gets quoted in AI answers more often than dense text.