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Flesch Readability Calculator

Calculate Flesch Reading Ease and Grade Level scores. Improve your content's readability.

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Get Flesch Reading Ease and Grade Level scores

Measure Your Writing's Readability

The Flesch formulas measure how easy your text is to read based on sentence length and word complexity. Great for writers, marketers, educators, and anyone who wants clear, accessible content.

Readability Analysis

Understanding Readability Scores

70-100
Easy to Read

5th-6th grade level. Easy for most readers.

50-70
Fairly Readable

7th-10th grade. Suitable for general audiences.

0-50
Difficult

College level and above. Academic or technical.

How this Flesch Readability Calculator works

This readability analyzer calculates Flesch Reading Ease and Flesch-Kincaid Grade Level scores using established formulas that assess text complexity based on sentence length and word syllable counts. The Flesch Reading Ease score ranges 0-100 with higher values indicating easier comprehension, while Grade Level indicates the US school grade required to understand the content.

The calculator parses text to count words, sentences, and syllables using linguistic algorithms that identify vowel clusters and common syllable patterns. Average words per sentence and syllables per word feed into the mathematical formulas: Reading Ease = 206.835 - (1.015 × ASL) - (84.6 × ASW) where ASL is average sentence length and ASW is average syllables per word.

Results include score interpretation (Very Easy to Very Difficult), reading time estimates, and actionable tips for improving readability through shorter sentences and simpler vocabulary.

How to Use

1

Enter Text

Paste or type the text you want to analyze.

2

View Scores

See Flesch Reading Ease and Grade Level scores.

3

Improve

Use insights to make your writing more readable.

Example Usage

Analyzing readability:

Input
The cat sat on the mat. It was happy.
Output
Flesch Reading Ease: 100 Grade Level: 1 Reading Level: Very Easy

Frequently Asked Questions

What is Flesch Reading Ease?
A readability formula that scores text from 0-100. Higher scores indicate easier-to-read text. A score of 60-70 is considered standard.
What is Flesch-Kincaid Grade Level?
This metric tells you the US school grade level needed to understand the text. A score of 8 means an 8th grader can understand it.
How is it calculated?
The formulas use average sentence length and average syllables per word. Shorter sentences and simpler words increase readability.
What score should I aim for?
For general audiences, aim for 60-70 (standard). Web content often targets 70+ for accessibility. Academic writing may be lower.

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The Flesch Readability Calculator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.