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.
Enter data

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.



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.


The data should be symmetrical.

Lower limit

Lower = Average - k * S.

Lower limit

Lower = Average - k * S.