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.