Barcelona Field Studies Centre

Create a Box Plot or Box and Whisker Chart

Box plots or box and whisker charts are a good way to display a range of information about your data sample. These plots contain the range, interquartile range, median, lower value, upper value, lower quartile and upper quartile. Box plots or box and whisker charts can be constructed for different sample sets to compare distributions.

Enter two data sets in the calculator below. Click the 'Calculate' followed by 'Create Box Plot' buttons and your selected box plot option will open in a new window. A menu appears above the box plots offering several options, including downloading an image of the data presentation.

Box Plot or Box and Whisker Chart Constructor

An annotated example of Cailleux's Roundness Index is presented below using box plots:

Cailleux Roundness Index box plots

The interquartile range is a measure of variability, based on dividing a data set into quartiles. It contains the middle 50% of a distribution and is a robust measure of statistical dispersion. It can also be used to find outliers in data.