Interquartile Range (IQR) Calculator
Calculate the interquartile range and identify potential outliers in your data
About Interquartile Range
The interquartile range (IQR) measures statistical dispersion by finding the difference between the 75th and 25th percentiles.
Formula: IQR = Q3 - Q1
Outlier Detection:
- Mild outliers: below Q1 - 1.5×IQR or above Q3 + 1.5×IQR
- Extreme outliers: below Q1 - 3×IQR or above Q3 + 3×IQR
Advantage: IQR is resistant to outliers, unlike range or standard deviation.
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.