Box Plot Maker
Paste one numeric column per group to build box-and-whisker plots. Each box shows the median, the interquartile range and the full spread, making it easy to compare groups.
How it works
A box plot summarises a distribution with five numbers: the minimum, the first quartile, the median, the third quartile and the maximum. The box spans the interquartile range (the middle 50% of the data), the line inside marks the median, and the whiskers reach out to the extremes. Plotting several groups side by side makes differences in centre and spread obvious at a glance. Paste one column per group, with an optional header row naming each group.
Quartiles are computed with linear interpolation, and the chart re-colours for light and dark themes. Use comma-, tab- or space-separated columns so you can paste directly from a spreadsheet, then screenshot the comparison.
Examples
- Each column of numbers becomes one box summarising that group.
- The box spans the interquartile range; the line is the median.
- Side-by-side boxes make group differences easy to compare.
Frequently asked questions
- What data does a box plot need?
- One numeric column per group. Each column's values are summarised into a five-number summary and drawn as a box with whiskers.
- What do the parts of a box mean?
- The box edges are the first and third quartiles, the line inside is the median, and the whiskers extend to the minimum and maximum values.
- How are quartiles calculated?
- With linear interpolation (the common type-7 method), so the quartiles match those reported by most spreadsheet and statistics tools.
- Is my data private?
- Yes. The plot is built in your browser and your data never leaves your device.