Outlier calculator

Detect outliers in your data set using the 1.5×IQR rule. Identifies values that fall outside the expected range.

Data

IQR outlier method

1. Calculate Q1 and Q3. 2. IQR = Q3 − Q1. 3. Lower fence = Q1 − 1.5×IQR. 4. Upper fence = Q3 + 1.5×IQR. Values outside the fences are outliers.

Mild vs extreme outliers

Mild: Between 1.5×IQR and 3×IQR from Q1 or Q3. Extreme: Beyond 3×IQR from Q1 or Q3.

Examples
With outlier 50 With outlier 100 No outliers
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