Box Plot Maker

A box plot (also called a box-and-whisker plot) is a chart that summarizes a dataset using five key statistics: minimum, Q1 (25th percentile), median (Q2), Q3 (75th percentile), and maximum. The central box shows the interquartile range (IQR), and the whiskers extend to the data bounds. Individual outliers are plotted as separate dots beyond the whiskers.

Use MakeCharts Box Plot Maker — it is completely free and requires no sign-up. Paste your raw values into the data panel, choose your group names and colors, and your box plot is generated instantly. You can download it as a PNG or SVG right away.

The bottom of the box is Q1 (25th percentile), the line inside the box is the median (Q2), and the top of the box is Q3 (75th percentile). The box height represents the IQR. Whiskers extend to the furthest data points within the allowed range, and individual dots beyond the whiskers are outliers.

Use a box plot when you want to compare distributions across multiple groups in a compact, side-by-side view. Histograms are better for exploring the detailed shape of a single distribution. Box plots excel at highlighting median differences, spread, and outliers across categories without cluttering the chart.

Yes. MakeCharts lets you add as many categories as you need. Each group gets its own box plotted on the same axis, making it easy to compare medians, spreads, and outliers across all groups at a glance.

Outliers are data points that fall more than 1.5 times the IQR below Q1 or above Q3 (the Tukey method). They are plotted as individual dots beyond the whiskers. MakeCharts detects and displays outliers automatically when using Tukey whiskers, or you can enter custom outlier values manually.

Tukey whiskers extend to the last data point within 1.5×IQR of the quartiles — values beyond that are shown as individual outlier points, which is the standard statistical convention. Min/max whiskers simply extend to the absolute minimum and maximum values in the dataset, showing the full range with no separate outlier points.

Yes. You can download your finished box plot as a high-resolution PNG for use in documents, slides, or social media, or as an SVG for scalable, print-quality output. Both formats are available on the free plan.

Not at all. Just paste your raw data values and the tool handles all the statistics automatically. If you prefer to enter summary statistics directly, you can do that too. The AI assistant can also help you get started if you describe your data in plain language.

Yes. The SVG export produces clean, high-resolution output suitable for academic publications and research reports. You can add axis labels, titles, and customize colors to meet your formatting requirements before exporting.