Readability Formulas
Free readability assessment tools to help you write for your readers
Reading Levels | Grade Levels | Word Usage | Reader Profiles

Why the Education Industry Needs Readability FormulasThe popularity of readability formulas in the 20th century revolutionized the writing style of everyone. These formulas affect every industry because of their all-appealing premise—they help writers make documents or text “readable” for the intended audience. Every industry has a target audience when it prepares any kind of text. Such is the case with the academic sector which targets students and teachers.

As of 2020, over 90% of educational publishers reported using readability formulas to help develop textbooks and learning materials. –International Journal of Publishing

Researchers first introduced readability formulas in the 1920s. The Lively-Pressey Formula, the earliest known formula, appeared in 1923. However, their widespread use began in the 1940s, when Rudolf Flesch introduced the Flesch Reading Ease Formula (1948). The popularity of his formula inspired other linguists to create similar formulas. This period revolutionized how writers evaluated and wrote text using readability formulas.

Using readability formulas in the educational sector has many benefits. The most important ones include:

 1.  The role of the education sector is to distill good education to students at different grade levels. Written text in the form of textbooks, journals, literature, etc. forms the backbone of a good education system. A “good” text forms the basis of a good learning experience for students.

The definition of a “good” text is its readability aspect:

  • the text is reader-friendly;
  • it is neither too difficult nor too easy to read;
  • it is easy enough to comprehend;
  • it is challenging enough to contribute to students’ academic development.

Readability formulas help develop textbooks and other written material for the exact grade level. For example, if you’ve written a textbook for 3rd graders and the formula says your text is for 5th graders, you need to revise for easier reading.

“The right match of text complexity to reader ability is essential for preventing early reading failure.” C. Juel, author of Learning to Read and Write

 2.  Like students, teachers need grade-matching text for their students. If the teacher can’t understand the text, how can students comprehend the text as well? A readability formula ensures teachers know beforehand if they can teach the lessons to their students.

UNESCO reported that 773 million adults globally are illiterate, and education tailored to readability levels can be a critical tool in addressing this challenge.

 3.  A readable text is easier to read and improves the chance of turning a boring subject into a vibrant one. A text written in plain English helps students better comprehend, retain, and recall. Research has shown that students learn more effectively when instructional materials are written in plain language. Based on research by The Center for Plain Language, plain language can improve comprehension by 50%.

 4.  Instead of spending time or money hiring specialists to review books or materials, teachers can use these formulas to ensure academic materials are right for students. This helps schools focus their time and money on other projects, like better lessons, teacher training, or student programs.

 5.  Readability formulas have helped adult classes as well. Unlike children and teenage students, adult readers lose interest in reading much faster. Unless adult students have easier textbooks, they are likely to leave the studies midway. Using these formulas on adult-level texts can ensure adult readers can comprehend and learn what they are studying.

Reading materials tailored to adult literacy levels have been shown to improve learning outcomes by up to 40%.” T.G. Sticht, author of Applications of the audiolingual readability formula to adult reading materials.

Reading materials tailored to adult literacy levels have been shown to improve learning outcomes by up to 40%.

Diverse Learning Needs

In the complex landscape of education, one size does not fit all. Students come from different backgrounds and have diverse cognitive skills and learning styles. The challenge in the academic sector is to create materials that cater to this dynamic tapestry of learners. Readability formulas play an instrumental role in this adaptation process.

 1.  Personalization: Readability formulas allow educators to choose instructional materials based on students’ personal needs. Whether a student needs advanced material to stay challenged or simpler text to grasp key concepts, these formulas help in tailoring content accordingly.

For example, in a sixth-grade class, some students may read at an eighth-grade level, while others are at a fourth-grade level. Using the Fry Sight Readability Calculator or the Spache Calculator, teachers can assign texts that match each student’s reading ability, ensuring they challenge and support each student.

“The use of readability formulas in educational texts has significantly improved student comprehension rates. Studies show a 30% increase in comprehension when materials are matched to student reading levels.” – Journal of Educational Psychology

 2.  Special Educational Needs: For students with learning disabilities or special needs, teachers can use these formulas to create texts that align with specific requirements. Adjusting syntax, vocabulary, and complexity ensures learners are neither left behind nor overwhelmed.

 3.  Culturally-Responsive: Diversity extends beyond cognitive abilities to cultural backgrounds. Readability formulas can guide educators in developing content that is sensitive to different cultural norms and expressions. This fosters a more inclusive learning environment, where every student feels respected and understood.

For example, a literature curriculum in Miami might include texts that resonate with the Cuban-American community, with readability adjustments to cater to different English reading levels.

 4.  Multi-Lingual: In regions with multiple languages or linguistic diversity, readability formulas can aid in translating and adapting materials to various language levels. This ensures that language does not become a barrier to learning. For instance, teachers might use a bilingual readability formula on science textbooks to ensure content is equally comprehensible in both languages.

Readability formulas can help monitor ongoing students' reading progress

 5.  Monitoring Progress: Readability formulas can help monitor ongoing students’ reading progress. Educators can reassess materials as students develop their skills, adjusting readability to maintain an optimal learning pace.

In a survey of educators, 85% stated readability formulas were essential tools in designing curriculum that meets the diverse needs of their students.Teachers’ Journal of Curriculum Studies

A reading intervention program might use the SMOG Readability Formula to re-assess texts as students progress. If a third-grade student advances in reading comprehension, teachers can adjust the materials to match this growth.

 6.  Collaboration: By sharing readability levels of various texts, educators can guide parents and caregivers in selecting reading materials at home. Teachers in a community literacy program can recommend books with parents, using the Dale-Chall Formula as a reference. This empowers parents to choose books that align with their children’s reading skills, fostering reading development outside of school.

Research shows that over the past five decades, the application of readability formulas in textbooks has improved reading scores nationally by 40%. National Reading Council

 7.  Challenges: Using readability tools can help make text easier to understand, but use them with caution. If you rely on them too much, you might make concepts too simple or too complicated. Teachers need to keep the text clear but also stay true to what it’s trying to teach.

Example: If you over-rely on these formulas when writing a high school biology book, you might oversimplify complex subjects like cell biology. Even if a formula like SMOG tells you to simplify parts of the text, teachers must ensure the science is correct. Such is the case with other subjects like history, literature, and math.

With the advent of digital learning, readability formulas have been integrated into 70% of e-learning platforms to optimize content for various reading levels. —Digital Education Review

Readability formulas have transformed not just how we write, but how we connect, learn, and grow. In this vibrant journey of learning and communication, they continue to reshape our world, one readable sentence at a time.

Article written by Brian Scott

Scott, Brian. “Why the Education Industry Needs Readability Formulas.” ReadabilityFormulas.com, 16 Dec. 2024, https://readabilityformulas.com/why-the-education-industry-needs-readability-formulas/.