What a box plot shows
A box plot (or box-and-whisker plot) summarizes a data set using five key values: the minimum, the first quartile (Q1), the median, the third quartile (Q3), and the maximum. The box spans from Q1 to Q3, with a line at the median, while the whiskers extend to the smallest and largest values that are not considered outliers.
How this calculator works
Enter between 3 and 10 numeric values. The calculator sorts them, finds the median, then splits the data into a lower half and upper half to find Q1 and Q3 (the median of each half). It computes the interquartile range (IQR = Q3 – Q1) and flags any value more than 1.5 times the IQR beyond Q1 or Q3 as a statistical outlier, the standard rule used in most box plots.
Leave unused value fields blank. This calculator is intended for general statistics education and data exploration.