Quartile Calculator
Calculate Q1, median (Q2), Q3, IQR, fences, outliers, range, and a five-number summary with live results and selectable quartile conventions.
Separate values with commas, spaces, semicolons, tabs, or new lines. Scientific notation is supported. Do not use thousands separators inside a single number.
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How this is calculated
This Quartile Calculator quickly finds the first quartile (Q1), median (Q2), third quartile (Q3), interquartile range (IQR), five-number summary, Tukey outlier fences, and potential outliers from raw numerical data. It supports inclusive interpolation, exclusive interpolation, and the median-of-halves convention so students and researchers can match the method used by their course, spreadsheet, or statistical workflow. Results update instantly as data changes, and the visual box plot helps you interpret the center, spread, and unusual values in your dataset.
