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* '''[[Median]] (''Q''<sub>2</sub> or 50th percentile)''': the middle value in the data set
* '''[[First quartile]] (''Q''<sub>1</sub> or 25th percentile)''': also known as the ''lower quartile'' ''q''<sub>''n''</sub>(0.25), it is the median of the lower half of the dataset.
* '''[[Third quartile]] (''Q''<sub>3</sub> or 75th percentile)''': also known as the ''upper quartile'' ''q''<sub>''n''</sub>(0.75), it is the median of the upper half of the dataset.<ref>{{cite journal |last1=Holmes |first1=Alexander |last2=Illowsky |first2=Barbara |last3=Dean |first3=Susan |title=Introductory Business Statistics |website=OpenStax |date=31 March 2015 |url=https://opentextbc.ca/introbusinessstatopenstax/chapter/measures-of-the-___location-of-the-data/ |access-date=29 April 2020 |archive-date=27 July 2020 |archive-url=https://web.archive.org/web/20200727025431/https://opentextbc.ca/introbusinessstatopenstax/chapter/measures-of-the-___location-of-the-data/ |url-status=dead }}</ref>
In addition to the minimum and maximum values used to construct a box-plot, another important element that can also be employed to obtain a box-plot is the interquartile range (IQR), as denoted below:
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