New Dale-Chall Score

The New Dale-Chall formula is a readability metric used to indicate how difficult a text is to read based on a predefined set of "common" words and the ratio of "difficult" words and words per sentence. Values correspond to the US grade level a reader requires to understand a text and should be interpreted as follows:

Value	School level	Student age range	Notes
4.9 or lower	Pre-kindergarten - 4th grade	3-10	Very easy to read.
5.0 - 5.9	4th grade - 6th grade	10-12	Easy to read. Conversational English for consumers.
6.0 - 6.9	6th grade - 9th grade	12-14	Fairly easy to read.
7.0 - 7.9	9th grade - 10th grade	14-16	Standard, plain English. Easily understood by 14- to 16-year-old students
8.0 - 8.9	10th grade - 12th grade	16-18	Fairly difficult to read.
9.0 - 9.9	12th grade - college graduate	18-22	Difficult to read.
10 and above	University graduates	22 and above	Very difficult to read. Best understood by university graduates.

Since the formula relies on a predefined set of words, the metric is only available for English and returns 0 for all other languages.

Check out the other readeability metrics:

• Flesch-Kincaid Grade Level
• Coleman-Liau Index
• Flesch Reading Ease
• Gunning Fog Index
• Automated Readability Index
• Linsear Write
• SMOG Index
• FORCAST Grade
• Average Grade

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