Flesch-Kincaid Grade Level Explained
7 min read · Published August 2026
In this article
What Flesch-Kincaid Grade Level measures
The Flesch-Kincaid Grade Level formula estimates how much formal education a reader would typically need to easily understand a piece of text, expressed as a U.S. school grade. A score of 6 suggests the text is comfortable for someone with a 6th-grade reading level; a score of 12 suggests it needs a high-school-graduate level of reading ability.
It was developed for the U.S. Navy in the 1970s, adapting Rudolf Flesch's earlier Reading Ease formula into a scale that was more immediately useful for matching training materials to readers' actual education levels. It's since spread far beyond the military into publishing, web content, healthcare communication, and government writing guidelines.
The formula
Grade Level = 0.39 × (average words per sentence) + 11.8 × (average syllables per word) − 15.59
Like the Reading Ease score, it's built from just two inputs: how long your sentences are, and how many syllables your words have. Longer sentences and longer words both push the grade level up; shorter ones bring it down. You don't need to calculate this by hand — the WordCountPro word counter shows it live next to the Reading Ease gauge as you type.
Grade Level vs. Reading Ease
These two formulas use the same underlying measurements — sentence length and syllables per word — but present the result differently, which sometimes causes confusion:
- Flesch Reading Ease gives a 0-100 score, where a higher number means easier to read. See our full guide to Flesch Reading Ease for the score ranges.
- Flesch-Kincaid Grade Level converts that same complexity into a school grade, which many people find more intuitive to act on — "write for an 8th grader" is easier to picture than "aim for a score of 65."
Because they're derived from the same inputs, improving one score generally improves the other. Which one to lead with is mostly a matter of which framing your audience understands faster.
What grade level should you aim for?
| Content type | Typical target grade level |
|---|---|
| General web content, blog posts | 6th-8th grade |
| Mass-market news writing | 7th-9th grade |
| Marketing and ad copy | 4th-6th grade |
| Children's books | 1st-5th grade, by age group |
| Legal and technical documents | 10th grade and above |
| Academic and scientific papers | College level (13+) |
Aiming for roughly 6th to 8th grade is a common default for general web writing because it's comfortable for the widest possible audience, including readers who are skimming, reading in a second language, or reading on a small screen — without feeling condescending for most everyday topics.
How to lower your grade level score
- Shorten your sentences. Splitting one 30-word sentence into two 15-word sentences has an outsized effect on the score.
- Choose shorter, more common words. "Use" instead of "utilize," "help" instead of "facilitate" — same meaning, fewer syllables.
- Cut throat-clearing phrases. Wind-ups like "it is important to note that" add length and syllables without adding meaning.
- Keep necessary complex terms. Proper nouns and technical terms your audience already knows shouldn't be avoided just to chase a lower score — readability is a guide, not a rule to follow blindly.
FAQ
What's the difference between Flesch Reading Ease and Flesch-Kincaid Grade Level?
They use the same underlying inputs, sentence length and syllables per word, but present the result differently. Flesch Reading Ease gives a 0-100 score where higher is easier. Flesch-Kincaid Grade Level converts that same complexity into a U.S. school grade level, which many people find more intuitive.
What grade level should web content aim for?
Most general-audience web content aims for roughly a 6th to 8th grade level, since that range is comfortable for the widest possible readership without feeling oversimplified for most topics.
How do I lower my Flesch-Kincaid Grade Level score?
Shorten your sentences and swap complex, multi-syllable words for simpler alternatives where the meaning doesn't change. Both factors feed directly into the formula, so small edits to sentence length and word choice move the score noticeably.
Is a lower grade level always better?
Not necessarily. Technical, academic, and legal writing often needs precise vocabulary that naturally scores higher, and that's appropriate for its audience. The right target grade level depends on who you're actually writing for.