IQR Calculator
Enter a set of numbers to calculate the first quartile, median, third quartile, interquartile range, lower and upper fences, and possible outliers instantly.
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Results
IQR = Q3 − Q1Q1 − 1.5 × IQRQ3 + 1.5 × IQRFrequently asked questions
What does IQR measure?
The interquartile range measures the spread of the middle 50% of a dataset. It is less affected by extreme values than the full range.
How are outliers detected?
A common rule labels values below Q1 − 1.5 × IQR or above Q3 + 1.5 × IQR as possible outliers.
Can I enter decimal and negative values?
Yes. The calculator accepts positive numbers, negative numbers, and decimals.
Results are estimates generated locally in your browser using standard mathematical formulas. They are for informational and educational purposes only and are not a substitute for verification in coursework, examinations or professional contexts requiring certified accuracy. VisionVix accepts no liability for decisions based on this tool's output.
