Why readability is worth measuring separately from keywords
Search engines and readers both reward content that clearly and efficiently answers a question, and one of the simplest, most measurable proxies for "clearly" is how easy a piece of writing is to read. Long, dense sentences full of multi-syllable words can bury a good answer under unnecessary friction, causing readers to bounce before they get to the point — and reader engagement signals are exactly the kind of thing that indirectly affects how well a page performs over time, even though readability itself isn't a direct ranking input the way a title tag is.
This tool calculates the Flesch Reading Ease score, one of the oldest and most widely used readability formulas, based purely on three countable properties of your text: the number of sentences, the number of words, and the number of syllables. It also derives an approximate US school grade level from the same inputs using the closely related Flesch-Kincaid Grade Level formula, giving you two different but complementary ways to interpret the same underlying measurement.
Reading the Flesch score and grade level together
The Flesch Reading Ease score runs from 0 to 100, with higher numbers indicating easier reading. A score in the 60-70 range is generally considered accessible to a broad general audience and is roughly the level most mainstream news writing and web content aims for; scores in the 90s indicate very simple writing suitable for early readers, while scores below 30 indicate genuinely dense, technical writing more typical of academic papers or legal documents. The grade level estimate translates the same measurement into a more intuitive "years of US schooling" figure — a grade level of 8 means the text should be comfortably readable by someone with an eighth-grade education, which is a commonly cited target for general-audience web content.
Neither number is a precise measurement of comprehension for any specific reader — they're statistical approximations based on sentence length and word complexity, not an understanding of the actual ideas being conveyed. A short, simple-sounding sentence can still be conceptually difficult if it describes an unfamiliar or abstract idea, and a longer sentence can still read smoothly if it's well-constructed. Use these scores as a general signal about structural complexity, not an absolute verdict on how good the writing is.
Practical ways to improve a low readability score
If your score comes back lower than you'd like, the two biggest levers are sentence length and word choice, both of which are visible directly in the statistics this tool reports. Splitting long sentences at natural conjunctions, cutting unnecessary clauses, and swapping a complex multi-syllable word for a shorter, more common synonym where the meaning doesn't suffer are usually the fastest ways to raise a Flesch score meaningfully. It's worth re-running the check after each editing pass, since the effect of tightening even a handful of long sentences is often larger than it feels while editing.
When a lower score is actually the right choice
Not every piece of content should chase the highest possible readability score. A technical reference document written for engineers, a legal disclosure, or an academic explanation of a specialized process may need precise terminology that simply can't be simplified without losing accuracy, and forcing that kind of content into short, simple sentences can make it feel condescending or strip out necessary nuance. Use the score as a diagnostic relative to your actual audience and purpose — a landing page aimed at a general consumer audience should usually aim notably higher than a detailed technical specification aimed at other specialists in the same field.