Flesch Reading Ease
The Flesch Reading Ease measures the reading difficulty of any text on a scale from 100 to 0, where higher numbers indicate materials easier to read.
Fun FactsReader's Digest Magazine has a readability index of 65, Time Magazine scores about 52, and the Harvard Law Review has a score generally in the low 30s.
Flesch-Kincaid Grade Level
The Flesch-Kincaid Grade Level index corresponds with the US grade level that a text would be clearly understood by students in that grade. For example, an index of 8.4 would indicate that the text is expected to be understood by an average 8th grade student (generally ages 12 to 14 in the US).
Powers-Sumner-Kearl Reading Level
The Powers-Sumner-Kearly Readability formula is one of the best formulas to calculate the reading level for children ages 7 to 10. It is a recalculated formula based on the famous Gunning-Fog Index and is engineered to assess materials used through the third grade. For example, an index of 7.6 would indicate that the text is expected to be understood by an average 7 year old.
Fry Readability Graph
The Fry Readability Graph gives you a visual representation of number of sentences and number of syllables per 100 words. Wherever the dot lands gives you a good estimate of the grade level the text is at.
New Dale-Chall Score:
The New Dale-Chall Formula is unique because, unlike other formulas that use word-length to assess word difficulty, it uses a count of difficult words unfamiliar to primary grade students.