Quartile Calculator
Calculate Q1, Q2, Q3 and the interquartile range (IQR) of your data.
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How to use
- Enter your numbers separated by spaces or commas.
- The result instantly shows the five-number summary (min, Q1, median, Q3, max).
- The IQR and the 1.5 × IQR rule also identify outliers.
Note: Quartiles are calculated with the linear interpolation method — the same method commonly used for box plots. Some textbooks use the exclusive method, which may give slightly different values.
Frequently Asked Questions (FAQ)
What does the Quartile Calculator show?
Q1, Q2 (the median), Q3 and the interquartile range (IQR) of your data set.
How do I enter my data?
Paste your numbers separated by spaces, commas or line breaks and the results appear instantly.
Is the Quartile Calculator free?
Yes. It is free, needs no signup, and runs entirely in your browser.
What is the interquartile range?
The range between Q1 and Q3, that is Q3 minus Q1, showing where the middle half of your data sits.