Iqr Calculator
Calculate the Interquartile Range (IQR) of a dataset. Enter comma-separated numbers to find Q1, Q3, and IQR.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the IQR Calculator
- Enter your dataset in the input field as a comma-separated list of numbers (e.g.,
1,2,3,4,5,6,7,8,9,10). - Click "Calculate IQR" to process the data.
- View the results displayed in three boxes:
- Q1 (25th percentile) – the median of the lower half of your sorted data.
- Q3 (75th percentile) – the median of the upper half of your sorted data.
- IQR – the interquartile range, calculated as Q3 − Q1.
Tip: The calculator automatically sorts your numbers and handles both even and odd dataset sizes. If you see an error, check that all entries are valid numbers separated by commas.
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Frequently Asked Questions
IQR stands for Interquartile Range, a measure of statistical dispersion. It is the difference between the third quartile (Q3) and the first quartile (Q1).
First, sort the data. Then find Q1 (median of lower half) and Q3 (median of upper half). IQR = Q3 - Q1.
IQR describes the spread of the middle 50% of the data. It is less affected by outliers than range.
