Methods for finding the interquartile rangeĪlthough there’s only one formula, there are various different methods for identifying the quartiles. You can think of Q1 as the median of the first half and Q3 as the median of the second half of the distribution. Q1 is the value below which 25 percent of the distribution lies, while Q3 is the value below which 75 percent of the distribution lies.
The interquartile range is found by subtracting the Q1 value from the Q3 value: Formula You can calculate the interquartile range by hand or with the help of our interquartile range calculator below.Ĭalculate the interquartile range by hand Visualise the interquartile range in boxplots.When is the interquartile range useful?.Methods for finding the interquartile range.Calculate the interquartile range by hand.
