📖 Smog Readability Calculator
Measure the reading grade level of any text using the SMOG Index formula
| Text Type | Typical SMOG Score | Reading Grade | Target Audience | Avg Reading Age |
|---|---|---|---|---|
| Children's Picture Books | 2 – 4 | 1st – 3rd | Young children | 6 – 8 yrs |
| Elementary Fiction | 4 – 6 | 3rd – 5th | Upper elementary | 8 – 11 yrs |
| Newspaper / News Sites | 7 – 9 | 7th – 9th | General public | 12 – 15 yrs |
| Popular Fiction (Adult) | 6 – 8 | 6th – 8th | General adult | 11 – 14 yrs |
| Business / Corporate Reports | 10 – 13 | 10th – 13th | Professionals | 15 – 18 yrs |
| Government Documents | 11 – 15 | 11th – College | Educated adults | 16 – 20 yrs |
| Medical Consent Forms | 12 – 16 | 12th – College+ | Patients / Providers | 17 – 21 yrs |
| Academic / Scientific Papers | 14 – 18 | College+ | Researchers / Experts | 18 – 22+ yrs |
| Legal Contracts | 15 – 20 | College+ | Legal professionals | 20+ yrs |
| Social Media Posts | 3 – 6 | 3rd – 6th | Mass general public | 8 – 12 yrs |
| Polysyllable Count | Per 30 Sentences | SMOG Grade (approx) | Difficulty Level |
|---|---|---|---|
| 0 – 5 words | Low | Grade 3 – 4 | Very Easy |
| 6 – 15 words | Below average | Grade 4 – 5 | Easy |
| 16 – 30 words | Average | Grade 5 – 6 | Fairly Easy |
| 31 – 55 words | Above average | Grade 7 – 8 | Standard |
| 56 – 90 words | High | Grade 9 – 10 | Fairly Difficult |
| 91 – 140 words | Very high | Grade 11 – 12 | Difficult |
| 141 – 200 words | Extremely high | Grade 13 – 15 | Very Difficult |
| 200+ words | Maximum | Grade 16+ | Professional / Expert |
| Domain | Example Polysyllabic Words | Syllable Count | Impact on Score |
|---|---|---|---|
| Medical | pharmacological, cardiovascular | 6 – 7 syllables | Very High |
| Legal | indemnification, jurisprudence | 5 – 6 syllables | High |
| Academic | epistemological, phenomenological | 7 – 8 syllables | Very High |
| Business | entrepreneurial, organizational | 5 – 6 syllables | High |
| Technology | telecommunication, infrastructure | 5 – 6 syllables | Moderate-High |
| General | understanding, communication | 4 – 5 syllables | Moderate |
| Simple/Common | however, community, together | 3 syllables | Low (borderline) |
The Smog Reading Level simply helps to estimate how difficult reading of text is. According to its definition, it matches the literacy of average folk at a certain age. When one says “Smog Reading Level of the 5th class“, that means that the text is almost equally difficult as that fits a typical child in the 5th year of school.
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Various methods exist for estimating that, and they show themselves in different forms.
What Reading Levels Mean and How to Use Them
The AR book level uses numbers with decimals for instance 4.2, on the other hand Lexile measures give bigger whole figures, like 770. The Guided Reading Levels, or Fountas and Pinnell levels, apply letters, for instance R. If a book level is 4.5, that wants to say that a student in that grade probably could read it alone. One can compare those systems one against the other by means of charts of reading levels, to choose fitting books for pupils.
There are practical resources for finding books at the right level. The Accelerated Reader Bookfinder allows students, teachers, parents and librarians to search according to ATOS book level or Lexile measure, or according to interest or title. The Book Wizard helps to sort the class library and prepare a list of books.
Online readability monitors can point the grade level of any writing piece and show phrases taht are hard to read.
A simple trick for checking whether a book answers to a reader is the placing of fingers. Reading, one lays a finger up for every unknown word. For a whole book two to three fingers mark the ideal spot.
If they reach for or five, the book probably is too hard.
Here is something useful to know. Leveled texts do not intend to be decodable. Current research stresses the need of clear teaching about phonemic awareness, phonetics and firm ties to literature, together with exercises by means of decodable texts.
That differs from the whole idea of leveled reading.
When a reader reaches around the 4th grade level, the world of books opens really broadly. The most books in a bookstore stand at around the 6th grade level. Some, like the Hunger Games, can be starting level, while others, like Anna Karenina, are much higher.
Sometimes books sound surprising, but in the end they turn out to be a real burden. Other times one feels them childish after reading to the finish.
Automatic tools for reading levels commonly are not reliable for fiction books. One of them can estimate a chapter at 6th grade level, while another points 11th or 12th. Smog Reading Level matters most when someone learns to read.
Later it only helps to read slowly, stay patient and pause, when one tires. Reading a bit daily helps that difficult writing style becomes more easy over time. Many kids books point their reading level on the cover, what simplifies the choice.
Textbooks commonly have their reading level noticeably, although books marked level one or twocommonly only approximate the grade level instead of being based on real tested reading levels.
