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About Readability >> READABILITY FORMULAS
New Dale-Chall - Flesch Reading Ease - Flesch Grade Level - Fry Graph -Gunning FOG -
Powers-Sumner- Kearl - SMOG - FORCAST - Spache - Readability Software

The Powers-Sumner-Kearl Readability Formula

The Powers-Sumner-Kearl Readability Formula is one of the best formulas to calculate the US grade level of a text sample based on sentence length and number of syllables. This formula is suited for primary age children (age 7-10) and, usually, is not considered ideal for children above the age of 10 years. The Powers-Sumner-Kearl Readability Formula is attributed to an article, A Recalculation of Four Adult Readability Formulas in 1958 in the Journal of Educational Psychology, University of Wisconsin, by R D Powers, W A Sumner, and B E Kearl.

Sumner and Kearl recalculated the Gunning Fog Index Formula using the McCall-Crabbs Reading Lessons. The newly revised Gunning Fog Index Formula was:

Grade level = 3.0680 + .0877
(Average Sentence Length) + .0984 (Percentage of Monosyllables)


The Power-Sumner-Kearl Readability Formula

Step 1: Select a sample passage of around 100 words.

Step 2: Calculate the exact number of words and sentences in the sample passage.

Step 3: Divide the number of words with the number of sentences to arrive at Average Sentence Length (ASL)

Step 4: Count the Number of Syllables (NS) in the sample passage.

Step 5: Apply the formula:

GL = 0.0778(ASL) + 0.455(NS) – 2.2029

where,

GL = US Grade Level

ASL = Average Sentence Length

NS = Number of Syllables

Step 6: The Reading Age is determined by applying the following formula:

RA = 0.0778(ASL) + 0.455(NS) + 2.7971

Where,

RA = Reading Age

ASL = Average Sentence Length

NS = Number of Syllables
The Powers-Sumner-Kearl readability formula is used to assess materials for use in the primary grades, through the third grade level.

Both Readability Calculations and Readability PLUS programs automatically calculate the The Powers-Sumner-Kearl Readability Formula. To see an example of how either program displays the formula’s results, click The Powers-Sumner-Kearl Readability Formula RESULTS.

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About Readability >> READABILITY FORMULAS
New Dale-Chall - Flesch Reading Ease - Flesch Grade Level - Fry Graph -Gunning FOG -
Powers-Sumner- Kearl - SMOG - FORCAST - Spache - Readability Software

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