**Use this calculator to compute the interquartile range from a set of numerical observations.**

This calculator calculates the interquartile range from a data set:

To **calculate the interquartile range** from a set of numerical values, enter the observed values in the box. Values __must be numeric__ and separated by commas, spaces or new-line. Ignore the Population/Sample selector unless you intend to examine the variance or the standard deviation. Click on "Submit Data" submit the data. To clear the calculator click on "Reset".

The interquartile range (IQR) is the difference between the third and the first quartiles. It is a measure of dispersion.

This simple formula is used for calculating the interquartile range:

Where x_{U} is the Upper quartile and x_{L} is the Lower quartile