Readability Checker | Text Complexity Tool

Readability Checker

This advanced tool analyzes your text using multiple readability formulas to determine how easy it is to understand. Get instant feedback on your writing’s complexity with Flesch-Kincaid, Gunning Fog, and other industry-standard metrics.

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The Flesch–Kincaid readability tests are readability tests designed to indicate how difficult a passage in English is to understand. There are two tests: the Flesch Reading-Ease, and the Flesch–Kincaid Grade Level. Although they use the same core measures (word length and sentence length), they have different weighting factors.

The results of the two tests are approximately inversely related: a text with a comparatively high score on the Reading Ease test should have a lower score on the Grade-Level test. Rudolf Flesch devised the Reading Ease evaluation; somewhat later, he and J. Peter Kincaid developed the Grade Level evaluation for the United States Navy.

The Flesch–Kincaid readability tests are designed to indicate comprehension difficulty when reading a passage of contemporary academic English. There are two tests: the Flesch Reading-Ease, and the Flesch–Kincaid Grade Level. Although they use the same core measures (word length and sentence length), they have different weighting factors.

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Words

Sentences

Syllables

Complex Words

Flesch Reading Ease

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Difficult Standard Easy

The Flesch Reading Ease test rates text on a 100-point scale. The higher the score, the easier it is to understand the text.

Flesch-Kincaid Grade Level

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This score indicates a U.S. grade level needed to understand the text.

Gunning Fog Index

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Estimates the years of formal education needed to understand the text on first reading.

Coleman-Liau Index

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Calculates the U.S. grade level required to understand the text based on characters.

Complex Words Found

Readability Recommendations

Aim for Shorter Sentences

Break up long sentences into shorter ones. Aim for an average sentence length of 15-20 words for general audiences.

Use Simple Words

Replace complex words with simpler alternatives when possible. For example, use “use” instead of “utilize”.

Vary Sentence Structure

Mix short and long sentences to create a natural reading rhythm and maintain reader engagement.

Target Your Audience

Adjust readability based on your audience. For general public, aim for 7th-8th grade level. For experts, 10th-12th may be appropriate.