What the tool does, how to run it, and what to expect from the result.
Sort the data and split it at the median; Q1 is the median of the lower half and Q3 the median of the upper half (with an odd count the median itself is left out). 3, 7, 8, 9, 12, 12, 15 has median 9, lower half 3, 7, 8 (Q1 = 7) and upper half 12, 12, 15 (Q3 = 12). Excel’s QUARTILE.INC interpolates instead and gives Q1 = 7.5.
A quick way to understand who this helps, what it solves, and where it connects next.
Students, teachers, analysts and researchers working with data.
Using the quartile calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
Excel QUARTILE.INC interpolates like PERCENTILE.INC. Textbooks and TI calculators use the median-of-halves method. Both are shown so you can match your course.
Yes. The second quartile is always the median.
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IQR = Q3 − Q1, with outlier fences
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Most frequent value, with a frequency table
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Find outliers with the 1.5 × IQR rule
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Range, minimum, maximum and IQR
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Quartiles use the median-of-halves method taught in most textbooks and used by TI-83/84 calculators. Excel’s interpolated values are shown for comparison.