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Passage StatisticsReadability Scores
Number of Sentences: Flesch Reading EaseThe Flesch score uses the number of syllables and sentence lengths to determine the reading ease of the sample.

A Flesch score of 60 is taken to be plain English. A score in the range of 60-70 corresponds to 8th/9th grade English level. A score between 50 and 60 corresponds to a 10th/12th grade level. Below 30 is college graduate level. To give you a feel for what the different levels are like, most states require scores from 40 to 50 for insurance documents.
Words Per Sentence: Gunning Fog Scale LevelThe Gunning Fog scale is similar to the Flesch scale in that it uses syllable counts and sentence length. The scale uses the percentage of 'Foggy' words, those that contain 3 or more syllables.

A fog score of 5 is readable, 10 is hard, 15 is difficult, and 20 is very difficult.
Characters Per Word: Flesch-Kincaid Grade LevelThe Flesch-Kincaid Grade Level heuristic indicates that the text can be read by the average student in the specified grade level.:
Percentage of Difficult Words (Estimated):
For more detailed analysis try the Difficult and Extraneous Word Finder.
SMOG GradeThe SMOG (Simple Measure of Gobbledygook) grade is commonly used in health care. The score represents the number of years of education needed to understand a passage of writing.:
SMOG score requires passage to be at least 30 sentences long.
Dale–Chall scoreDale-Chall is one of the most accurate readability metrics. Rather than rely on syllable counts to identify diffult words, Dale-Chall incorporates a list of 3,000 easy words which were understood by 80% of fourth-grade students. The readability score is then computed based on how many words pressent in the passage are not in the list of easy words.

A score of 4.9 or lower indicates the passage is easily readable by the average 4th grade. Scores between 9.0 and 9.9 indicate the passage is at a college level of readability.
Fry Readability Grade LevelFry Readability graph was developed by developed by Edward Fry and is often selected for it's simplicity and accuracy. The graph has two axes: the average number of syllables (x-axis) and the average number of sentences (y-axis) per hundred words. Passages of text that are at least one hundreds words can be plotted on the graph to find the corresponding grade level.:
Fry redability requires passage to be at least 100 words long.
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Difficult and Extraneous Word Finder

The difficult & extraneous word finder helps you write clearly and concisely by identifying possible weak points in your prose, including rare words, hard words, adverbs and extra hedge words.

Passive Voice Detector

Sentences with passive voice construction tends to contain extra words when compared to its active voice counterpart. Extra words make for longer sentences which can be more difficult to understand. Use Passive Voice Detector to find these overly wordy sentences.

About the Readability Analyzer

Readability refers to the relative ease in which a written passage of text can be read and understood by others. Readability metrics, such as the Flesch-Kincaid and Gunning Fog index, are algorithmic heuristics for predicting readability and are typically based on sentence length and vocabulary. Readability metrics are most commonly used in settings where clarity is crucial. For example, some states have requirements that legal documents and health care documents have met a minimum level of readability to ensure the intended audience can understand them. Keep in mind that readability is not a measure of writing quality.

The best approach to modifying a passage's readability is to rewrite the passage. Be careful when iteratively tweaking a passage not to fall into the trap of writing for the formula. Writing to the formula could lead passages that contain shorter, choppy sentences that are actually more difficult to read despite recieving a better score.

We have provided two tools to aid rewriting a passage. The Difficult and Extraneous Word Finder can be used to explore vocabulary. It identifies rare words, and long polysyllabic words with more than three syllables. The Passive Voice Detector identifies sentences with passive structure. Passive voice is common in the scientific literature because it places the emphasis on the object being investigated rather than the author doing the investigation. Sentences with passive voice construction, however, tend to be longer, and harder to read.

This writing sample readability analyzer estimates the readability of a passage of text using the Flesch-Kincaid Reading Ease, Gunning Fog Index, Kincaide Grade Level, SMOG formula and Dale–Chall Score metrics. metrics.

Questions? Read more about the writing sample analyzer on my FAQ Blog Post

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