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Our Flesch-Kincaid Calculator is the perfect tool for anyone who wants to improve the readability of their text. It's easy to use and provides accurate results.
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Analyze content for free!The Flesch-Kincaid calculator on this page gives you two readability measures at once: the Flesch Reading Ease score (0–100) and the Flesch-Kincaid grade level (U.S. school grade). Both use the same formula—average sentence length and average syllables per word—so you can see how easy your text is to read and what grade level it matches. Paste your text above, click analyze, and get instant results with no signup.
Rudolf Flesch developed the Reading Ease formula in 1948; the U.S. Navy (J. Peter Kincaid and colleagues) adapted it into a grade level in 1975. Today it is one of the most widely used readability metrics in education, government, and business. Writers, editors, and content teams use it to match content to their audience and to meet plain-language guidelines.
Educators use it to check that handouts and assignments match student reading ability. Marketers and web writers use it to keep copy accessible (often aiming for 8th grade or lower). Healthcare and government communicators use it to hit targets like 6th–8th grade for patient or public materials. Students use it to check that essays and reports are at the right level. Anyone who cares about clear writing can paste text here and see where they stand.
The Flesch Reading Ease score runs from 0 (very difficult) to 100 (very easy). The Flesch-Kincaid grade level is the same formula expressed as a U.S. grade—e.g. 7th grade or 10th grade. This calculator shows both so you can use whichever your guideline or audience prefers. For a 0–100–only view, try our Flesch Reading Ease Calculator; for a grade-level–focused page, see the Flesch-Kincaid Grade Level Calculator.
For general audiences, a Reading Ease score of 60–70 or a grade level of 8th or below is often recommended. To improve: shorten sentences, use words with fewer syllables where possible, and replace jargon with everyday words. One main idea per sentence helps. Run your text through the calculator above, revise, and check again to see how your score or grade changes.
Need all nine formulas in one place? Use our Combined Readability Score Checker to get Flesch-Kincaid, SMOG, Gunning Fog, Dale-Chall, ARI, Coleman-Liau, Linsear Write, Lix, and Rix side by side. For individual calculators (SMOG, Gunning Fog, and more), see the Readability Calculators hub.
The Flesch-Kincaid readability score (also called Flesch Reading Ease) is a formula that measures how easy a piece of text is to read. It produces a score from 0 to 100, where higher scores mean easier reading. The formula considers average sentence length and average syllables per word to estimate the reading difficulty.
The Flesch-Kincaid grade level converts the readability score into the U.S. school grade level needed to understand the text. For example, a grade level of 8 means the text is suitable for an 8th grader. It uses the same factors as the reading ease score—sentence length and syllable count—but outputs a grade level instead of a 0–100 score.
For general audiences, aim for a Flesch Reading Ease score of 60–70 (8th–9th grade level) or higher. For consumer content and marketing, 70–80 (7th grade) is often recommended. Technical or academic writing may appropriately score lower. Many organizations target 6th–8th grade for maximum accessibility.
To improve readability: use shorter sentences, choose simpler words with fewer syllables, break up long paragraphs, and avoid jargon. Replace complex words with common alternatives where possible. Our calculator helps you measure your current score so you can track improvements as you revise.
Flesch Reading Ease gives a score from 0–100 (higher = easier). Flesch-Kincaid Grade Level gives a U.S. school grade (e.g., 8th grade). Both use the same inputs—sentence length and syllables per word—but present the result differently. Grade level is often preferred when you need to match content to a specific audience education level.
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Learn what the Flesch Reading Ease Score is and how a Flesch Kincaid calculator can improve your writing. Boost readability with our free Flesch readability score calculator!
