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Reading Level Calculator

Check readability with Flesch-Kincaid, Gunning Fog, and Coleman-Liau

35 words3 sentences64 syllables6 complex words

Average Reading Level

Grade 11.9

Grade 12 (High School)

Readability Scores

Flesch-Kincaid Grade

Grade 11 (High School)

10.5

Flesch Reading Ease

Difficult

40.3

Gunning Fog Index

Grade 12 (High School)

11.5

Coleman-Liau Index

Grade 14 (College)

13.8

Text Statistics

Words35
Sentences3
Syllables64
Complex Words6
Avg Words/Sentence11.7
Avg Syllables/Word1.83

Frequently Asked Questions

Q

How does the Flesch-Kincaid Grade Level formula work?

The Flesch-Kincaid Grade Level estimates the U.S. school grade needed to understand a text. It uses two ratios: words per sentence and syllables per word. The formula is FK = 0.39 * (words / sentences) + 11.8 * (syllables / words) - 15.59. A result of 8.0 means an 8th grader can understand the text.

  • Formula: FK = 0.39 * (words/sentences) + 11.8 * (syllables/words) - 15.59
  • A score of 5.0 means a 5th grader can read it comfortably
  • Most newspapers target grade 6-8 for broad accessibility
  • Academic papers typically score grade 12-16
  • Lower scores indicate simpler, more accessible writing
Grade LevelReading LevelExample Text Type
1-5ElementaryChildren's books, basic instructions
6-8Middle SchoolNewspapers, popular magazines
9-12High SchoolLiterary fiction, science articles
13-16CollegeAcademic journals, legal documents
Q

What is the Flesch Reading Ease score?

The Flesch Reading Ease scores text on a 0-100 scale where higher means easier. The formula is 206.835 - 1.015 * (words/sentences) - 84.6 * (syllables/words). A score of 60-70 is considered standard English, while 90-100 is easily understood by an 11-year-old.

  • Formula: FRE = 206.835 - 1.015 * (words/sentences) - 84.6 * (syllables/words)
  • 90-100: Very easy, understood by 5th graders
  • 60-70: Standard, understood by 8th-9th graders
  • 30-60: Difficult, college-level reading required
  • 0-30: Very confusing, graduate-level or professional text
Score RangeDifficultyTypical Audience
90-100Very Easy5th grade student
60-70StandardHigh school student
30-60DifficultCollege student
0-30Very ConfusingGraduate/professional
Q

How does the Gunning Fog Index differ from Flesch-Kincaid?

The Gunning Fog Index focuses on complex words (3+ syllables) rather than total syllable count. Its formula is Fog = 0.4 * ((words/sentences) + 100 * (complexWords/words)). Fog tends to give higher grade levels than Flesch-Kincaid because it penalizes polysyllabic words more heavily.

  • Formula: Fog = 0.4 * ((words/sentences) + 100 * (complexWords/words))
  • Complex words = words with 3 or more syllables
  • Ideal Fog index for public documents is 7-8
  • Legal and medical texts often score 17+ on Fog
  • Fog is especially useful for business and technical writing
Q

What is the Coleman-Liau Index and when should I use it?

The Coleman-Liau Index uses characters per word instead of syllables, making it faster for computer analysis. The formula is CLI = 0.0588 * L - 0.296 * S - 15.8, where L is average letters per 100 words and S is average sentences per 100 words. It correlates well with Flesch-Kincaid for most texts.

  • Formula: CLI = 0.0588 * L - 0.296 * S - 15.8
  • L = average number of letters per 100 words
  • S = average number of sentences per 100 words
  • Does not require syllable counting (faster to compute)
  • Best for automated analysis of large text corpora
Q

What reading level should I target for my audience?

For general public content, target grade 6-8 (Flesch Reading Ease 60-70). Marketing copy should aim for grade 4-6. Academic writing typically falls at grade 12-16. Health information should target grade 6 or below for patient-facing materials per AMA guidelines.

  • Web content and blogs: grade 6-8 for maximum reach
  • Marketing and advertising: grade 4-6 for quick comprehension
  • Technical documentation: grade 10-12 for educated readers
  • Academic papers: grade 13-16 is standard for peer review
  • Health literacy: grade 6 or below for patient materials
Content TypeTarget GradeFlesch EaseAudience Size
Social media4-680-90Broadest
News articles6-860-70General public
Business reports10-1240-60Professionals
Academic papers13-1610-30Specialists

Example Calculations

1Simple Children's Text

Inputs

Text"The cat sat on the mat. The dog ran fast."
Stats10 words, 2 sentences, 10 syllables

Result

Flesch-Kincaid Grade-1.8

FK = 0.39 * (10/2) + 11.8 * (10/10) - 15.59 = 1.95 + 11.8 - 15.59 = -1.84. Negative values indicate pre-kindergarten reading level. Flesch Reading Ease would be approximately 107, indicating extremely easy text.

2Newspaper Article Excerpt

Inputs

Text"The city council approved a new budget for road repairs. Officials expect the project to cost approximately twelve million dollars over three years."
Stats25 words, 2 sentences, 37 syllables

Result

Flesch-Kincaid Grade6.8

FK = 0.39 * (25/2) + 11.8 * (37/25) - 15.59 = 4.875 + 17.464 - 15.59 = 6.75. Gunning Fog counts "approximately" and "officials" as complex words (3+ syllables), raising the Fog index to approximately 9.3.

3Academic Writing Sample

Inputs

Text"Epistemological considerations necessitate a comprehensive examination of methodological frameworks."
Stats9 words, 1 sentence, 27 syllables

Result

Flesch-Kincaid Grade20.0

FK = 0.39 * (9/1) + 11.8 * (27/9) - 15.59 = 3.51 + 35.4 - 15.59 = 23.3. The high syllable-to-word ratio (3.0) drives the grade level well beyond college. All 9 words qualify as complex under Gunning Fog.

Formulas Used

Flesch-Kincaid Grade Level

FK = 0.39 * (W / S) + 11.8 * (Syl / W) - 15.59

Estimates the U.S. school grade level needed to understand the text based on sentence length and syllable density.

Where:

FK= Flesch-Kincaid grade level score
W= Total number of words in the text
S= Total number of sentences in the text
Syl= Total number of syllables in the text

Gunning Fog Index

Fog = 0.4 * ((W / S) + 100 * (CW / W))

Estimates reading difficulty by factoring in complex words (3+ syllables) alongside sentence length.

Where:

Fog= Gunning Fog index grade level
W= Total number of words
S= Total number of sentences
CW= Number of complex words (3+ syllables)

Coleman-Liau Index

CLI = 0.0588 * L - 0.296 * S - 15.8

Uses character count instead of syllables, where L is letters per 100 words and S is sentences per 100 words.

Where:

CLI= Coleman-Liau index grade level
L= Average number of letters per 100 words
S= Average number of sentences per 100 words

Understanding Readability Formulas

Readability formulas estimate how difficult a text is to read by analyzing sentence length, word length, and syllable patterns. The three most widely used formulas are Flesch-Kincaid Grade Level, Gunning Fog Index, and Coleman-Liau Index, each weighting these factors differently.

The Flesch-Kincaid formula was developed for the U.S. Navy in 1975 to assess the readability of technical manuals. It outputs a U.S. grade level, making it intuitive for educators and content creators. A Flesch-Kincaid score of 8.0 means an average 8th grader can understand the text.

For the most accurate assessment, use all three indices together and look at the average. If Flesch-Kincaid says grade 7 but Gunning Fog says grade 10, the text likely has some complex vocabulary within otherwise simple sentence structures.

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Last Updated: Mar 25, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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