🪜 Quartile Calculator

Compute quartiles and the five-number summary with control over the interpolation method. Toggle between Tukey (median of halves) or Excel inclusive percentiles for classroom or spreadsheet alignment.

Dataset Input

Comma, space, newline, or tab separated numbers

Mixed separators accepted. Invalid tokens will be flagged.

Method:

Minimum

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Q1 (25%)

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Median (Q2)

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Q3 (75%)

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Maximum

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Interquartile Range

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Five-Number Summary

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Insights

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How to Use

  1. Paste or type your dataset into the values input.
  2. Select the quartile computation method that matches your textbook or spreadsheet.
  3. Click Calculate Quartiles to display Q1, Q2, Q3, min, max, and IQR.
  4. Review the five-number summary and insights to detect skewness or outliers.
  5. Use the cleaning/reset buttons to prepare for new datasets.

Formula Reference

Quartiles divide the sorted dataset into four equal parts. Tukey’s method uses medians of halves, while Excel’s inclusive method employs percentile interpolation. Reference: NIST/SEMATECH Engineering Statistics Handbook.

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