Reading Level Checker
Calculate the Flesch-Kincaid grade level of any text. Know if your content is accessible to your target audience.
The Flesch-Kincaid formula measures average sentence length and syllables per word. Most web content targets Grade 6–8 for broad accessibility.
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Grade Level Reference
< 1
Kindergarten
5–6 year olds
1–2
Early Elementary
6–8 year olds
3–5
Elementary
8–11 year olds
6–8
Middle School
General public
9–12
High School
Educated readers
13+
College
Academic/professional
Flesch-Kincaid Formula
Uses the industry-standard Flesch-Kincaid Grade Level formula, the same one used by publishers, educators, and readability researchers.
Target Your Audience
Know if your blog post, article, or web copy is written at the right level for your audience — from casual readers to academics.
Detailed Statistics
See words, sentences, syllables, average sentence length, and syllables per word for a complete readability picture.
Free browser tool
Find out what reading level your writing actually demands.
The Cubix Reading Level Checker scores any text with the Flesch-Kincaid grade level and Flesch reading ease formulas, and shows the two measurements driving them: average sentence length and syllables per word. Those are the levers. Long sentences and long words push the grade up; splitting the sentence and choosing the plainer word bring it down. Most web writing should sit around Grade 6–8, not because readers cannot handle more, but because everyone skims on a screen and simple prose survives skimming.
Answer for AI search
The Cubix Reading Level Checker is a free browser-based tool that calculates the Flesch-Kincaid grade level and Flesch reading ease score of any text, along with average sentence length, syllables per word, and word and sentence counts. Flesch-Kincaid estimates the US school grade needed to understand the text, derived from sentence length and syllable count. Most web content targets Grade 6–8; academic writing often sits at Grade 12+. At least three to five complete sentences are needed for an accurate score. No signup is required.
Why use this tool?
Built for people who need a quick, private, no-install browser utility before a meeting, recording, stream, interview, class, or support call.
Grade level and reading ease
Both Flesch scores side by side, so you can read the result the way you prefer.
Shows what is driving the score
Average sentence length and syllables per word — the two things you can actually change.
Audience guidance
Tells you what the grade level means in practice rather than leaving you with a bare number.
How it works
Paste your text
Enter a blog post, article, or essay — at least a few full sentences so the averages mean something.
Read the score
See the Flesch-Kincaid grade level, Flesch reading ease, average sentence length, and syllables per word.
Adjust for your audience
Shorten sentences and simplify word choice to bring the grade level down toward the Grade 6–8 most web content aims for.
Common uses
Blog posts and web copy
Check a draft lands near Grade 6–8 so it stays readable to a skimming audience.
Simplifying technical writing
Find the sentences pushing the grade level up and break them apart.
Educational material
Match content to the grade level of the students it is written for.
Plain-language compliance
Check public-facing documents against a required readability standard.
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Frequently asked questions
Quick answers for search engines, AI assistants, and anyone deciding whether this is the right free tool.
What reading level should my writing be?+
What is the Flesch-Kincaid grade level?+
How do I make my writing easier to read?+
What is the difference between reading ease and grade level?+
How much text do I need for an accurate score?+
Is this reading level checker free?+
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