Box plot / box-and-whisker plot example
Start with one distribution and see its median, quartiles, whiskers, and potential outliers.
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Calculate quartiles, whiskers, outliers, and group comparisons
Understanding box plot
Use Vizvero as a free online box plot maker, boxplot creator, box-and-whisker plot generator, and five-number summary calculator. Paste raw numeric values, optionally group them for side-by-side comparisons, inspect the calculated statistics, choose which labels to show, animate the result, and export PNG, SVG, or MP4.
A box plot, also called a box-and-whisker plot or boxplot, summarizes a numeric distribution with the first quartile (Q1), median, third quartile (Q3), and whiskers. The box spans the interquartile range (IQR = Q3 − Q1), which contains the middle half of the observations.
Vizvero calculates the observed minimum and maximum, Q1, median, mean, Q3, IQR, Tukey whisker endpoints, sample count, and potential outliers from your raw values. Quartiles use linear interpolation, while whiskers extend to the most extreme observed values inside the 1.5×IQR fences.
With a group column, Vizvero automatically creates multiple box plots on the same scale. This supports side-by-side, grouped, double, parallel, and comparative box-plot layouts without requiring precomputed summary statistics.
Use this chart when
- You want a compact view of center, spread, quartiles, skew, and potential outliers.
- You need to compare two or more distributions on the same numeric scale.
- A five-number summary and IQR are more useful than the detailed frequency shape of a histogram.
Choose another chart when
- You need to see peaks, gaps, or multimodal frequency shape; use a histogram.
- You only have a handful of observations and every point should remain visible.
- You are comparing one aggregate value per category rather than full distributions; use a bar chart.
Prepare your data
- 01Use one numeric value column and one group column. Give every row the same group for a single box plot, or repeat group labels to create side-by-side boxes.
- 02Paste raw observations instead of precomputed quartiles; Vizvero recalculates the full summary whenever the data changes.
- 03Potential outliers stay in the observed min/max statistics even when they are drawn separately beyond the whiskers.
Editable examples
Box plot examples and layouts
See the layout with real sample data first, then open the exact example in this maker and replace the data with your own.
Four-step workflow
How to make a box plot in Vizvero
- STEP 1
Paste raw values and groups
Enter one numeric value per row and use the group column when you want double, grouped, parallel, or side-by-side box plots.
- STEP 2
Inspect the calculated statistics
Review count, min, Q1, median, mean, Q3, max, IQR, whisker range, and outlier count for every group.
- STEP 3
Choose labels and markers
Toggle median, Q1/Q3, whisker, mean, and outlier annotations to make the box-and-whisker structure as explicit as your audience needs.
- STEP 4
Style, animate, and export
Adjust theme, line width, point size, axes, and animation, then export the same chart scene as PNG, SVG, or MP4.
Make the chart easier to read
- Compare medians together with IQR and whisker span; one statistic rarely describes the whole distribution.
- Treat potential outliers as observations to investigate, not points to delete automatically.
- Keep measurement units consistent across groups so side-by-side boxes remain directly comparable.
- Use the labeled example when readers need the five-number summary or quartile values spelled out on the chart.
From data to finished asset
Designed themes
Change typography, spacing, geometry, axes, background, and palette without rebuilding the chart.
Static and animated export
Export the same chart scene as PNG, true vector SVG, or frame-rendered MP4.
Browser-first workflow
Editing and chart rendering happen in the browser, so you can work without creating an account.
Frequently asked questions
How do I make a box and whisker plot?
Paste raw numeric observations into the Value column. Use one group label for a single box or multiple group labels for side-by-side boxes. Vizvero calculates the quartiles, median, IQR, whiskers, mean, and potential outliers automatically.
What is the five-number summary in a box plot?
The traditional five-number summary is the observed minimum, Q1, median, Q3, and observed maximum. Vizvero also shows mean, IQR, Tukey whisker endpoints, sample count, and outlier count.
What do the box and whiskers represent?
The box spans Q1 to Q3 and the line inside marks the median. Vizvero uses Tukey 1.5×IQR fences, so each whisker ends at the most extreme observed value that is not beyond its fence.
What is a modified box plot?
A modified box plot commonly draws potential outliers as separate points and keeps whiskers at the most extreme non-outlier observations. Vizvero uses this Tukey-style convention.
How does Vizvero calculate outliers?
Values below Q1 − 1.5×IQR or above Q3 + 1.5×IQR are treated as potential outliers. They remain part of the raw data and observed min/max statistics while being drawn separately when outliers are enabled.
Can I make side-by-side, grouped, double, or parallel box plots?
Yes. Put each observation in the Value column and repeat its category in the Group column. Vizvero creates one box per unique group on a shared axis; two groups form a double box plot and additional groups extend the same comparative layout.
Can I label quartiles, whiskers, median, and mean?
Yes. Q1/Q3 labels, whisker labels, median labels, the mean marker, and outlier points are independent Chart controls.
What is the difference between a box plot and a histogram?
A box plot compresses a distribution into summary statistics such as quartiles, median, IQR, whiskers, and outliers. A histogram shows frequency across numeric bins and can reveal peaks, gaps, and detailed shape.
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