IQR Calculator
Calculate the interquartile range (IQR) of a dataset by finding Q1, Q3, and the spread of the middle 50%.
Enter numbers separated by commas, spaces, or line breaks.
| Metric | Value |
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Privacy: calculations run locally in your browser. No values are stored or transmitted.
How it works
This tool sorts the dataset, finds the lower quartile Q1 and upper quartile Q3,
then computes:
IQR = Q3 − Q1
Examples
- If Q1 = 10 and Q3 = 18, then IQR = 8
- IQR describes the spread of the middle half of the data
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What is interquartile range (IQR)?
IQR is the difference between the third quartile (Q3) and the first quartile (Q1). It measures the spread of the middle 50% of the data.
- How is IQR calculated?
Sort the data, find Q1 and Q3, then compute IQR = Q3 − Q1.
- Why is IQR useful?
IQR is less sensitive to extreme outliers than the full range, so it is often used to describe typical spread.
- Are calculations stored?
No. Everything runs locally in your browser.