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.
Result will appear here.
| 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
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.