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Box Plot Maker

Draw a box and whisker plot with quartiles, 1.5 IQR whiskers and outlier dots.

Draw a box plot

Median: —
Q1: —
Q3: —
IQR: —
Outliers: —
Quartiles use linear interpolation and the whiskers reach the furthest values inside 1.5 times the IQR.

How to use the Box Plot Maker

  1. Paste your numbers, one value per line.
  2. Click Draw chart to sort the values and find the quartiles.
  3. Read the median, quartiles and any outlier dots on the plot.

Features

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Frequently Asked Questions

Common questions about the free online box plot maker.

Paste one number per line and click Draw chart. The values are sorted, the quartiles are found and the box and whiskers are drawn.
The tool uses linear interpolation between the two nearest values, which is the same method used by most statistics software.
Each whisker runs from the box to the furthest value that is still within 1.5 times the interquartile range from the box.
Any value below Q1 minus 1.5 times the IQR, or above Q3 plus 1.5 times the IQR, is drawn as a separate dot.
The box spans the first quartile to the third quartile, so it covers the middle half of all your values.
No. The values are sorted and drawn locally in your browser, so nothing leaves your device.
Yes. The box plot is redrawn to fit the screen width and works on phones, tablets and desktops.
Yes. It is completely free with no account, no sign-up and no limit on the number of plots.

Last updated: October 10, 2026