How this calculator works
Enter the values for first value, second value and review the units before calculating.
Formula / method
IQR = Q3 − Q1
Worked example
If Q1 is 2 and Q3 is 8, the interquartile range is 6.
Assumptions and limitations
Q1 and Q3 use linear interpolation across sorted values.
IQR describes central spread and does not summarize every outlier or tail.