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Results of the Gunning’s Fog Index (or FOG) Readability Formula

The FOG readability formula is widely used in the health care industry and throughout the entire business community.

The FOG formula takes into consideration (1) the total number of words, (2) the number of words of three or more syllables, as well as (3) the total number of sentences.

Since FOG readability scoring aims for 90% comprehension, except for the SMOG readabiity formula FOG grade level scores are inclined to be higher than the other formulas included in Readability Calculations and Readability PLUS.

As applied in industry and business, many reading experts feel that no technical material should score higher than grade level 14, no business material higher than grade level 12, and no clerical material higher than grade level 8.

Both Readability Calculations and Readability PLUS display this formula’s scoring results on a screen which may contain other formula results as well.


This screen snapshot illustrates how both programs display the results.

(1) For easy and quick user reference, the material evaluated, date and time are all specified at the very top of the screen.

(2) You may apply multiple formulas in one execution of the software.

(3) All raw counts which figured in the calculations of any one or more of the applied formulas are included in the display.

(4) All manner of relevant information is readily available on a (scrollable) field at the right side of the screen.

All relevant scoring data and information is displayed together on a single screen!

(5) If so desired, a “File” button enables you to save all grade level and raw count data.

(6) A “Print” button enables you to obtain hardcopy printout of the data.

Both Readability Calculations and Readability PLUS programs automatically calculate the THE GUNNING'S FOG INDEX READABILITY FORMULA.

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