Outlier calculator

Tukey's Fences (Boxplot), Z-Score

Information Standard deviation calculator Mean median mode Q1 Q3 calculator
The outlier detection tool may show step by step demonstration of the outliers detection calculations and draw a chart.
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When entering data, press Enter or Space or Tab or , after each value.
Leaving empty cells is okay. The tool ignores empty cells or non-numeric cells.

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Information

Tukey's fences

Q1 - Lower quartiles.
Q3 - Upper quartiles.
Interquartile Range : IRQ = Q3 - Q1.
Usually with k=1.5.

Lower fence formula

Lower fence = Q1 - k * IRQ.

Upper fence formula

Upper fence = Q3 + k * IRQ.

Z-score

The data should be symmetrical.

Lower limit

Lower = Average - k * S.

Lower limit

Lower = Average - k * S.