Quartile & IQR Calculator (Outliers)
Math ToolsQ1, median, Q3, IQR and outlier fences
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History
All history →Quartile & IQR Calculator (Outliers) — at a glance
Get the five-number summary and spot outliers.
How to use it — step by step
A list of numbers separated by commas, spaces or new lines.
Add your text
Paste or type your input into the box. The Sample button fills in an example.
Press Find Quartiles
The result is made instantly inside your browser.
Copy the result
Use the Copy button, or send it to another tool.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is the IQR?+
Q3 minus Q1. It measures the spread of the middle half of the data.
Which quartile method is used?+
Linear interpolation, the same as Excel’s QUARTILE.INC.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.