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The result is an index number that rates the text on a 100-point scale. The higher the score, the easier it is to understand the document.

Also known as the Laesbarhedsindex or Leesbaarheid index, the LIX formula gives a score based on sentence length and the number of long words (i.e. longer than six characters).
This index can be used on English, French, German, Greek and Swedish.

The Automated Readability Index is a readability test designed to gauge the understandability of a text. Its output is an approximate representation of the U.S. grade level needed to comprehend the text.

The Coleman-Liau Index is a readability test designed to gauge the understandability of a text. Its output approximates the U.S. grade level thought necessary to comprehend the text.

The result of the Flesch-Kincaid grade level is a rough measure of how many years of schooling it would take someone to understand the content.

For example, a score of 8.2 would indicate that the text is expected to be understandable by an average student in 8th grade (usually aged 13-15 in the U.S.).

The Gunning-Fog index – Fog stands for “frequency of gobbledygook”  – is a rough measure of how many years of schooling it would take someone to understand the content.

The lower the number, the more understandable the content will be to your readers. Results over seventeen are reported as seventeen, where seventeen is considered post-graduate level.

The new Dale-Chall Formula is based on a list of 3,000 words familiar to most 4^th grade students, as a higher percentage of familiar words makes a text easier to read and understand.

The Powers-Sumner-Kearl Readability Formula is used to calculate the US grade level of a text sample based on sentence length and number of syllables. Best suited for primary age children (age 7-10), it is not considered ideal for children above the age of 10 years, hence above grade 4.

SMOG (Simple Measure of Gobbledygook) is a readability formula that estimates the years of education needed to completely understand a piece of writing.

The Huerta Reading Ease scores range from 0 to 100, with 0 as the most difficult and 100 as the least difficult to read. A score below 30 is considered very difficult, while a score of 70 is considered appropriate for adult readers.

Also known as the Laesbarhedsindex or Leesbaarheid index, the LIX formula gives a score based on sentence length and the number of long words (i.e. longer than six characters).
This index can be used on English, French, German, Greek and Swedish.