About the Quartile & IQR Calculator
The five-number summary and outlier detection, with a box plot.
What it is
The Quartile & IQR Calculator computes the five-number summary (minimum, Q1, median, Q3, maximum) for any data set, using the exclusive (Tukey) median-of-halves method, and flags outliers using the standard 1.5รIQR rule. A box-and-whisker diagram visualizes the result.
Features
Five-number summary
Min, Q1, median, Q3, and max computed instantly.
Stated quartile method
Uses the exclusive/Tukey method explicitly, since methods vary between tools.
Outlier detection
Flags values outside Q1 โ 1.5รIQR and Q3 + 1.5รIQR.
Box-and-whisker diagram
Visualizes the summary with outliers plotted separately.