Free Readability Scorer — Check Your Writing Grade Level

Clear writing is not about dumbing things down — it is about respecting your reader's time. The most effective marketing copy, blog posts, and product documentation are written at a reading level that the broadest possible audience can understand on the first pass.

Our free readability scorer analyzes your text and returns Flesch-Kincaid grade level, Flesch Reading Ease, Gunning Fog index, and other metrics instantly. Paste your text, see your scores, and identify exactly where your writing is harder to read than it needs to be. No signup, no data stored.

Flesch-Kincaid Explained

The Flesch-Kincaid readability tests are the most widely used readability formulas in the English-speaking world. There are two versions:

Flesch Reading Ease scores text on a scale from 0 to 100. Higher scores mean easier reading. A score of 60 to 70 is considered ideal for general adult content. Below 30 is "very difficult" (academic papers, legal documents). Above 90 is "very easy" (children's books).

Flesch-Kincaid Grade Level converts the same inputs into a US school grade level. A score of 8.0 means an 8th grader could understand your text. For web content, aim for 6 to 8. For marketing emails, aim for 5 to 7. For technical documentation, 10 to 12 is acceptable if your audience is technical.

Both formulas use the same two inputs: average sentence length (words per sentence) and average syllables per word. Shorter sentences and simpler words produce better scores. The formulas were originally developed for the US Navy in 1975 to assess the readability of technical manuals.

The Gunning Fog Index

The Gunning Fog Index takes a slightly different approach. Instead of counting syllables, it counts "complex words" — words with three or more syllables (excluding proper nouns, compound words, and common suffixes). The formula estimates the years of formal education needed to understand a passage on first reading.

A Fog index of 12 requires a high school senior's reading level. A Fog index of 17 requires a college graduate's level. For general audiences, aim for a Fog index under 12. Major newspapers like the Wall Street Journal average around 11. USA Today averages around 8.

The Fog index is particularly useful for catching unnecessary jargon. A passage full of multi-syllable industry terms will spike the Fog score even if the sentences are reasonably short — flagging vocabulary as the issue rather than sentence structure.

Sell Custom Apparel — We Handle Printing & Free Shipping

Ideal Reading Levels by Context

Content Type	Target Grade Level	Flesch Ease Score
Marketing landing pages	5 – 7	65 – 80
Blog posts	6 – 8	60 – 70
Email newsletters	5 – 7	65 – 80
Product documentation	8 – 10	50 – 60
Academic papers	12 – 16	20 – 40
Legal documents	14 – 18	10 – 30
Children's content	2 – 4	85 – 100

Notice the pattern: the broader your audience, the lower your target reading level should be. The average American adult reads at an 8th grade level. Writing above that level means progressively excluding portions of your potential audience. This is not a judgment — it is math.

How to Improve Your Readability Score

Three changes make the biggest difference:

• Shorten your sentences. The single biggest factor in readability. Aim for an average of 15 to 20 words per sentence. Break long compound sentences into two. If a sentence has more than 25 words, it almost always reads better as two shorter sentences.
• Use simpler words. Replace multi-syllable words with shorter alternatives. "Utilize" becomes "use." "Facilitate" becomes "help." "Commence" becomes "start." "Approximately" becomes "about." "Subsequent" becomes "next." Your readers will thank you, even the highly educated ones.
• Break up long paragraphs. Three to four sentences per paragraph maximum for web content. Dense blocks of text look intimidating on screens. White space between paragraphs gives readers visual breathing room.

Additional tactics: use active voice instead of passive ("we shipped the update" not "the update was shipped"). Cut filler phrases ("in order to" becomes "to," "at this point in time" becomes "now," "due to the fact that" becomes "because"). Read your text aloud — if you run out of breath mid-sentence, it is too long.

Frequently Asked Questions

What is a good Flesch-Kincaid reading level for web content?

For web content and marketing copy, aim for a Flesch-Kincaid grade level of 6 to 8. This means an average 12 to 14 year old can understand it — which is the sweet spot for broad readability. Most bestselling authors write at a 7th to 8th grade level. Higher is not better — it just means fewer people will read your content all the way through.

What is the difference between Flesch Reading Ease and Flesch-Kincaid Grade Level?

Flesch Reading Ease scores text on a 0 to 100 scale — higher means easier to read (aim for 60 to 70 for general content). Flesch-Kincaid Grade Level converts the same factors into a US school grade level — a score of 8.0 means an 8th grader can understand it. They measure the same thing (sentence length and syllable count) but express it differently.

How do I improve my readability score?

Three changes have the biggest impact: shorten your sentences (aim for 15 to 20 words average), replace multi-syllable words with simpler alternatives (use "start" not "commence," "help" not "facilitate"), and break up long paragraphs (3 to 4 sentences max). Reading your text aloud also reveals awkward phrasing that scoring formulas miss.