Outlier Boundary Calculator

The interquartile range, often abbreviated IQR, is the difference between the 25th percentile (Q1) and the 75th percentile (Q3) in a dataset.

We often declare an observation to be an outlier in a dataset if it has a value 1.5 times greater than the IQR or 1.5 times less than the IQR.

This calculator uses this formula to automatically calculate the upper and lower outlier boundaries for a given dataset.

Simply enter the list of the comma-separated values for the dataset, then click the “Calculate” button:

Dataset values:

Q1: 5.0000

Q3: 20.7500

Interquartile Range: 15.7500

Lower Outlier Boundary: -18.6250

Upper Outlier Boundary: 44.3750

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