Automated Readability Index Calculator
Calculate the ARI to determine the U.S. grade level needed to understand a text.
ARI Analysis
characters, words, sentences
ARI Formula
ARI = 4.71(Characters/Words) + 0.5(Words/Sentences) - 21.43
The result is a number that approximates the U.S. grade level needed to comprehend the text.
Advantages of ARI
- * Uses characters instead of syllables (easier to count)
- * Can be computed by machine without error
- * Designed for real-time monitoring
- * Used in military and educational contexts
ARI Score
0
N/A
📚Grade Level
N/A
👤Age Range
Enter text to analyze
🔤Chars/Word
📝Words/Sentence
Readability Level
N/A - Suitable for readers aged Enter text to analyze
About ARI
The Automated Readability Index (ARI) was developed by the U.S. military in 1967. Unlike other formulas that count syllables, ARI uses character counts, making it ideal for electronic text analysis and real-time readability monitoring.