What is the readability Flesch reading ease score?

The readability Flesch reading ease score is a mathematical formula that rates text on a 100-point scale based on sentence length and syllable count. Higher scores (60–70+) indicate plain English that is easy to understand, while scores below 30 indicate dense academic or legal prose.

How does the automated readability index (ARI) work?

The automated readability index (ARI) calculates the approximate US grade level needed to comprehend a text. Unlike formulas that rely on syllable counting, ARI uses character counts per word: ARI = 4.71 * (characters/words) + 0.5 * (words/sentences) - 21.43.

Content Clarity & Readability Engine

Flesch Reading Ease & ARI Calculator

Analyze readability flesch reading ease and the automated readability index in real-time with comprehensive grade level and syllable diagnostics.

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Flesch Reading Ease

82.4

Easy (6th Grade)

Target 60–80 for general web audience.

Automated Readability Index (ARI)

5.2

5th – 6th Grade (Age 10–11)

Based on character and sentence ratios.

Flesch-Kincaid Grade

5.8

Middle School Level

US school education equivalent.

Word Count: 31

Sentence Count: 3

Avg Words/Sentence: 10.3

Avg Syllables/Word: 1.35

Character Count: 182

Understanding Readability Flesch Reading Ease and the Automated Readability Index

In digital publishing and content marketing, readability directly impacts bounce rates and reader comprehension. Both the readability flesch reading ease scale and the automated readability index provide objective, data-backed metrics to calibrate your prose for your target audience.

Flesch Reading Ease Formula

Formulated by Rudolf Flesch in 1948:

Score = 206.835 - 1.015(Total Words / Total Sentences) - 84.6(Total Syllables / Total Words)

Scores of 60–70 correspond to 8th–9th grade level (ideal for commercial web copy).

Automated Readability Index (ARI) Formula

Designed for real-time automated assessment:

ARI = 4.71 × (Characters / Words) + 0.5 × (Words / Sentences) - 21.43

The resulting score directly equals the US grade level.