Quartile Calculator
Find Q1, Q2, Q3, and the interquartile range.
Split data into four
Quartiles divide a sorted data set into four equal parts, summarizing its spread more robustly than the mean and standard deviation. They power box plots and outlier rules.
For 7, 15, 36, 39, 40, 41, Q1 is 15, the median is 37.5, and Q3 is 40, giving an interquartile range of 25. The IQR captures the middle half of the data.
Robust and private
The calculation runs in your browser, so your data is never uploaded.
Frequently Asked Questions
What are quartiles?
The three values that split sorted data into four equal parts. Q2 is the median; Q1 and Q3 are the medians of the lower and upper halves.
What is the IQR?
The interquartile range, Q3 minus Q1, a robust measure of spread that ignores extreme outliers.
Which method is used?
Tukey’s hinges, which exclude the median when splitting the halves.
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