Question 1

What kind of chart is a box plot?

Accepted Answer

It is a chart that summarizes the distribution of data using the "median", "quartiles (Q1 and Q3)", and "outliers". You can grasp the spread, the position of the center, skewness, and the presence of outliers at a glance.

Question 2

What do the box, whiskers, and outliers represent?

Accepted Answer

Box: from the first quartile Q1 to the third quartile Q3 (the middle 50% range) Center line of the box: the median (50th percentile) Whisker: usually extends to the innermost observed value within the range of Q1−1.5×IQR and Q3+1.5×IQR IQR: the interquartile range (Q3 − Q1) Outliers: observed values lying outside the whiskers (shown as points)

Question 3

What kind of data and situations is it suited for?

Accepted Answer

Comparing distributions between groups (categories) (e.g., test scores by class, measured values by product lot) Detecting outliers and grasping differences in variance Checking the spread and bias of a distribution that cannot be seen from the average alone

Question 4

How should I prepare and enter the data?

Accepted Answer

Prepare multiple numerical data points for each category (group). Use numbers only (blanks and non-numeric values are ignored/excluded). Decimals are supported. If there are units, align them to the same unit.

Question 5

How are outliers handled?

Accepted Answer

Normally, values smaller than Q1−1.5×IQR or larger than Q3+1.5×IQR are displayed as points as outliers. Outliers are not excluded from the calculation; they are emphasized in the visualization of the distribution.

Question 6

What is the five-number summary?

Accepted Answer

Minimum (often corresponds to the end of the lower whisker) First quartile Q1 Median (second quartile) Third quartile Q3 Maximum (often corresponds to the end of the upper whisker)

Question 7

Can I compare multiple groups?

Accepted Answer

By displaying multiple categories (groups) side by side, you can compare the center, spread, and outliers of their distributions.

Question 8

What should I keep in mind when the sample size is small?

Accepted Answer

Estimates of the median and quartiles tend to become unstable Outlier detection may become overly sensitive It is safer to secure a sufficient sample size, or to use other visualizations (such as scatter plots or strip plots) as well

Question 9

What are the advantages and limitations of a box plot?

Accepted Answer

What can and cannot be read from a box plot? Can be read: the median, spread (IQR), skewness, and the presence of outliers Hard to read: the fine shape of the distribution (multimodality, the exact shape of the density)

Question 10

How can I save the chart as an image?

Accepted Answer

Click the "Download Image" button below the preview area to download your chart in PNG/JPEG/SVG format with your chosen quality. If you want to change the aspect ratio, drag the handle at the bottom-right corner of the preview frame to adjust it.

Question 11

Is there an auto-save feature?

Accepted Answer

Yes, there is. Your chart data is saved automatically to your browser's local storage. When you reload the page, or close and reopen your browser, you can restore the saved data. You can also revert to the default data by pressing the reset button at the top-right of the data input area. Local storage data is saved only in your browser and is not shared with other users. If local storage is disabled in your browser settings, the auto-save feature will not work. Clearing your browser cache will also delete the saved data.

Question 12

How do I save my data temporarily?

Accepted Answer

Click the "Save & Publish Chart" button below the preview area to temporarily save your chart. You can re-edit it later using the URL and password issued when you saved it. You can also publish the chart publicly via URL.

Question 13

How do I load saved data?

Accepted Answer

You can load a chart using the "Resume from Saved Data" button. When loading, enter the URL and password issued when you saved it.

Question 14

Can I bulk-enter data via CSV or copy & paste?

Accepted Answer

Open the dialog from the "Bulk Input" button, then copy and paste from a spreadsheet/Excel or an HTML table, or select a CSV file. Please check the screen for what to enter in each row and column. After pasting, edit it in the preview and click "Confirm & Apply" to reflect it in the chart.

Online Box Plot Generator

Preview

Data Input

Settings & Style

Frequently Asked Questions

How to Use Online Box Plot Generator

Enter your data

Customize the design

Download the image

All Free Graph & Chart Tools

Bar Charts & Comparison

Line & Area Charts

Pie Charts & Proportions

Distribution & Statistics

Hierarchy & Relationships

Flow & Process

Shapes & Space

Quality Control (QC)

Others

Online Box Plot Generator

Preview

Data Input

Settings & Style

Settings & Style

Frequently Asked Questions

Q.What kind of chart is a box plot?

Q.What do the box, whiskers, and outliers represent?

Q.What kind of data and situations is it suited for?

Q.How should I prepare and enter the data?

Q.How are outliers handled?

Q.What is the five-number summary?

Q.Can I compare multiple groups?

Q.What should I keep in mind when the sample size is small?

Q.What are the advantages and limitations of a box plot?

Q.How can I save the chart as an image?

Q.Is there an auto-save feature?

Q.How do I save my data temporarily?

Q.How do I load saved data?

Q.Can I bulk-enter data via CSV or copy & paste?

How to Use Online Box Plot Generator

Enter your data

Customize the design

Download the image

All Free Graph & Chart Tools

Bar Charts & Comparison

Line & Area Charts

Pie Charts & Proportions

Distribution & Statistics

Hierarchy & Relationships

Flow & Process

Shapes & Space

Quality Control (QC)

Others