Reading Level Check
{{ summaryFigure }}
{{ summaryLine }}
{{ fitBadge }} {{ readingEaseDisplay }} {{ wordCountDisplay }} {{ averageSentenceDisplay }} {{ cautionCountDisplay }} {{ gradeSpreadDisplay }}
Paste or drop a TXT handout, notice, assignment, or student draft.
Drop a TXT reading passage here.
Pick the grade span you are checking against, or No target for formula-only output.
Consensus uses the median; named formulas show that formula as the headline.
Use line-aware for bullet lists or classroom notices with short lines.
Enter 6-20 letters; formulas still use the full pasted passage.
letters
Enter 8-60 words; lower values catch more sentence flags.
words
Optional label such as Grade 6 science handout.
Formula Score Band Copy
{{ row.name }}
{{ row.basis }}
 {{ row.score }} {{ row.band }}
# Words Sentence Copy
{{ row.index }} {{ row.words }} {{ row.text }}
No sentences meet the current long-sentence threshold.
Word Letters Count First sentence Copy
{{ row.word }} {{ row.letters }} {{ row.count }} {{ row.context }}
No words meet the current long-word threshold.
Metric Value Detail Copy
{{ row.label }} {{ row.value }} {{ row.detail }} 

                    

                

            


        

    

                

                

                    

                        

                            Tags: Education, Text
                        

                        

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Reading level estimates turn visible features of English prose into rough grade-style signals. Sentence length, word length, syllable load, and longer vocabulary can all make a passage feel harder, so a quick estimate can help teachers, editors, parents, and students decide whether a draft is likely to match the intended readers.


  
The numbers are most useful before a handout, notice, assignment, or student draft is finalized. A grade estimate can show that a short science paragraph may be harder than it looks because it contains technical words, while a long paragraph about familiar events may still read comfortably if the sentences are short and the vocabulary is common.


  

    Workflow diagram showing text sample, counts, formulas, and review flags feeding a readability estimate.
  


  
A readability formula is not the same as comprehension testing. It cannot know whether a reader has background knowledge, whether a word has already been taught, whether the formatting supports scanning, or whether the task itself is confusing. It gives an early warning about surface difficulty, then human review still has to decide whether the passage fits the class, assignment, and purpose.


  
English readability formulas also depend on clean sentence detection. Bullet lists, fragments, abbreviations, copied tables, and mixed-language text can move the estimate more than the wording deserves. Treat the grade number as a prompt to inspect the text, not as a pass-or-fail label for a student or a class.






  
Technical Details:


  
Most formulas in this family reduce prose to a few countable quantities: words per sentence, syllables per word, letters per word, and the share of words estimated at three or more syllables. Those quantities are easy to compute, which makes them useful for quick screening, but they are only proxies for difficulty. A passage can score high because it has technical vocabulary, long sentences, or both.


  
Word tokens can include letters, combining marks, digits, internal apostrophes, and internal hyphens. Sentence detection depends on the selected splitting mode. The standard mode uses punctuation with a small abbreviation guard, line-aware mode treats sparse line breaks as possible sentence endings, and punctuation-only mode follows punctuation without the abbreviation guard. Letter counts exclude punctuation, spacing, and digits.


  
Formula Core

  
The grade estimate is built from five grade-level formulas. Flesch Reading Ease is shown as its own ease score because it uses a different scale where higher usually means easier.


  

    
      
        
          ASL
          =
          WS
        
        
          ASW
          =
          SYLW
        
        
          FRE
          =
          206.835−1.015⁢ASL−84.6⁢ASW
        
        
          FKGL
          =
          0.39⁢ASL+11.8⁢ASW−15.59
        
        
          GFI
          =
          0.4⁢(ASL+100⁢CWW)
        
        
          SMOG
          =
          1.043⁢CW⁢30S+3.1291
        
        
          CLI
          =
          0.0588⁢L−0.296⁢S100−15.8
        
        
          ARI
          =
          4.71⁢CHW+0.5⁢ASL−21.43
        
      
    
  


  

    

      
      
        

          Symbol
          Meaning
          Important limit
        

      
      
        

          W
          Counted word tokens.
          Numbers can count as words, but digits do not add to the letter count.
        

        

          S
          Detected sentences.
          Bullets and abbreviations can change this count, especially in short samples.
        

        

          SYL
          Estimated English syllables.
          Proper nouns, acronyms, and non-English words may be estimated poorly.
        

        

          CW
          Words estimated at three or more syllables.
          Used by Gunning Fog and SMOG, so technical vocabulary can raise both scores.
        

        

          CH, L, S100
          Letters, letters per 100 words, and sentences per 100 words.
          Coleman-Liau and ARI respond strongly to word length even when syllables are uncertain.
        

      
    

  


  
The consensus grade is the median of Flesch-Kincaid Grade, Gunning Fog, SMOG approximation, Coleman-Liau, and Automated Readability Index after each grade-level score is clamped from K to 18+. The formula focus setting can replace that median as the headline grade, but the separate Formula Scores table still shows every formula so disagreements remain visible.


  

    

      
      
        

          Flesch Reading Ease score
          Displayed band
          How to read it
        

      
      
        

          90+
          Very easy
          Usually short sentences and simple words.
        

        

          80 to 89.9
          Easy
          Still light prose, often suited to broad audiences.
        

        

          70 to 79.9
          Fairly easy
          Readable for many general classroom and public-facing passages.
        

        

          60 to 69.9
          Plain English
          Moderate sentence and word difficulty.
        

        

          50 to 59.9
          Fairly difficult
          Inspect long sentences and longer vocabulary before assigning it.
        

        

          30 to 49.9
          Difficult
          Likely to need support, prior vocabulary work, or revision for younger readers.
        

        

          Below 30
          Very difficult
          Often dense or technical, but verify sentence splitting before drawing conclusions.
        

      
    

  


  

    

      
      
        

          Condition
          When it appears
          Why it matters
        

      
      
        

          Very short sample
          Fewer than 30 words.
          One long word or one missing period can swing the grade estimate.
        

        

          Short estimate
          30 to 99 words.
          The score is still a quick estimate rather than a stable passage review.
        

        

          Sparse punctuation
          Three or more non-empty lines with too few sentence marks.
          Line-aware splitting may describe bullets or notices better.
        

        

          Abbreviation caution
          Common forms such as Dr., etc., e.g., or i.e. appear.
          Sentence counts may still drift even with the standard guard.
        

        

          Mixed-language caution
          More than 15% of letters are outside basic Latin letters.
          The English formulas and syllable estimate may not apply well.
        

      
    

  






  
Everyday Use & Decision Guide:


  
For a first pass, paste one complete English passage into Text, choose the nearest Target grade band, and leave Formula focus on Consensus grade estimate. The headline grade, classroom fit badge, reading ease badge, word count, average sentence length, caution count, and formula spread give a fast sense of whether the passage deserves closer review.


  
Use the target band as planning help, not as an automatic approval rule. A passage marked Within target band can still contain an unfamiliar term that needs teaching. A passage marked Above target band may still be appropriate if it is part of a supported lesson with vocabulary preview and guided reading.


  
    
    
  • Use Formula Scores when you want to see which formula raised or lowered the estimate.
    • 
    
  • Use Grade Fit Gauge when you need a visual check against the selected target band.
    • 
    
  • Use Sentence Flags to find long sentences at or above the current word threshold.
    • 
    
  • Use Long Word Flags to find repeated long words and the first sentence where each one appears.
    • 
    
  • Use Metric Details when you need the supporting counts behind the headline result.
    • 
    
  • Use JSON when another workflow needs a structured record of the same run.
    • 
  


  
The advanced settings matter most when the pasted text is not ordinary paragraphs. Try Line-aware for bullets and notices when each line behaves like a separate sentence. Keep Standard punctuation with abbreviation guard for most classroom prose. Use Punctuation only only when you want the sentence splitter to follow punctuation exactly.


  
Long-word and long-sentence thresholds do not change formula scores. They only decide what appears in the flag tables. That makes them useful for revision review: lower the long-sentence threshold when editing early elementary material, or raise it when checking older student writing where longer sentences may be acceptable.


  
Stop and inspect the text when warnings appear, the formula spread is large, or the sentence count looks wrong. Those signals usually mean the grade estimate is being driven by sample length, punctuation, formatting, or vocabulary rather than by a steady reading pattern.






  
Step-by-Step Guide:


  
Use one passage at a time so the counts describe a real reading task rather than a mix of unrelated materials.

  
    
    
  1. Paste the passage into Text or load a TXT file with Browse TXT. When text is present, the summary box and result tabs appear.
    2. 
    
  2. Select Target grade band. The Classroom fit result will show Below target band, Within target band, or Above target band.
    3. 
    
  3. Leave Formula focus on Consensus grade estimate unless a class, publisher, or review process asks for Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, or ARI specifically.
    4. 
    
  4. Open Advanced if the passage is a list, notice, or abbreviation-heavy text. Change Sentence splitting if the Sentences metric looks too low or too high.
    5. 
    
  5. Adjust Long word threshold and Long sentence threshold only after reading the first result. The flags update without changing the formula scores.
    6. 
    
  6. Review Formula Scores, then check Sentence Flags and Long Word Flags for sentences or terms that a real reader may need help with.
    7. 
    
  7. If a warning appears, fix the source text or choose a better splitting mode before relying on the grade estimate. Very short samples, sparse punctuation, and mixed-language text need extra caution.
    8. 
  






  
Interpreting Results:


  
Start with the numeric grade and the formula spread. A narrow spread means the grade-level formulas mostly agree. A large spread means the passage is pulling different formulas in different directions, often because sentence length, syllable estimates, and letter-based measures disagree.


  
The classroom fit badge compares the headline grade to the selected target band. The comparison uses inclusive whole-grade endpoints, while the displayed grade band uses decimal cutoffs. That means a grade like 2.6 can display as K-2 early elementary but still sit above a K-2 target. Read the exact grade, the band label, and the fit badge together.


  

    

      
      
        

          Displayed grade band
          Lower rule
          Upper rule
          Interpretation cue
        

      
      
        

          Early reader
          0
          < 1
          Very simple surface structure.
        

        

          K-2 early elementary
          1
          < 3
          Low sentence and word complexity.
        

        

          Grades 3-5 elementary
          3
          < 6
          Often manageable for upper elementary readers with familiar vocabulary.
        

        

          Grades 6-8 middle school
          6
          < 9
          Good range for many middle school passages.
        

        

          Grades 9-10 high school
          9
          < 11
          Expect longer sentences or denser vocabulary.
        

        

          Grades 11-12 high school
          11
          < 13
          Often suited to advanced high school reading with support as needed.
        

        

          College / adult
          13
          18+
          Usually dense, technical, or sentence-heavy.
        

      
    

  


  
Do not treat a low grade as proof that the passage teaches well. Read the flagged sentences and long words, then check whether the vocabulary is expected for the lesson. A science paragraph with photosynthesis may be hard because the concept is new, not because every long word should be removed.


  
When a result looks surprising, check Sentences, Average sentence length, Complex words, Formula spread, and the warning messages first. Those fields usually explain why the headline grade moved.






  
Worked Examples:


  
Short plant handout

  
The built-in plant passage has 42 words and 4 detected sentences. With the consensus focus, the Primary grade estimate is about 4.2 grade, the displayed band is Grades 3-5 elementary, and Flesch Reading Ease is about 95.5 or Very easy. If the target is Grades 6-8, the fit badge says Below target band. That does not make the passage wrong; it may simply be a warm-up, review, or lower-stakes reading sample.


  
Dense science paragraph

  
A three-sentence paragraph about photosynthesis can produce a very different result. In one sample with 41 words, 9 complex words, and an average sentence length of 13.7 words, the consensus grade is about 13.4 grade and the displayed band is College / adult. Long Word Flags finds words such as Photosynthesis, chlorophyll, and respiration. For a middle school target, this is a clear cue to pre-teach terms, split sentences, or add support.


  
Bullet-style reminder with sparse punctuation

  
A notice written as four lines without sentence punctuation can look much harder than intended. With standard splitting, the sample Bring notebook / Read chapter five / Answer questions one through six / Submit the reflection Friday is treated as one sentence, so the consensus grade is about 11.3 grade. Switch Sentence splitting to Line-aware for bullets and notices, and the same words become 4 detected sentences with a consensus grade near 7.2 grade. The warning about sparse punctuation points directly to the fix.






  
FAQ:


  

    Is this a certified reading assessment?
    
No. The Formula caveat row says Estimate only because the result is built from surface counts. Use it for screening and revision, not for labeling a student or proving comprehension.

  


  

    Why do the formulas disagree?
    
Each formula emphasizes different counts. Flesch-Kincaid and Flesch Reading Ease use sentence length and syllables per word, Gunning Fog and SMOG react to complex words, and Coleman-Liau and ARI react to letter length. Formula spread shows how far apart the grade-level estimates are.

  


  

    Why did a bullet list score too high?
    
If a list has few periods, standard splitting may treat several lines as one long sentence. Choose Line-aware for bullets and notices, then recheck Sentences and Average sentence length.

  


  

    What files can I load?
    
The file input accepts plain TXT files. If the source is a PDF, slide deck, or word-processing document, convert the passage to plain text first so the sentence and word counts describe the text itself rather than hidden formatting.

  


  

    Is pasted text sent to a server for the readability check?
    
The readability calculations run in the browser. Treat sensitive passages carefully because entered values may still appear in browser history, copied links, shared screens, or screenshots if the page state is shared.

  






  
Glossary:

  

    
Flesch Reading Ease

    
A readability score where higher values usually mean easier prose.


    
Grade-level formula

    
A formula that reports an approximate U.S. school-grade reading level from text counts.


    
Complex word

    
A word estimated at three or more syllables for the Gunning Fog and SMOG calculations.


    
Formula spread

    
The difference between the highest and lowest grade-level formula estimates.


    
Sentence splitting

    
The rule used to decide where one counted sentence ends and the next begins.

  






  
References: