IQR Calculator
Calculate the interquartile range (IQR) of a dataset by finding Q1, Q3, and the spread of the middle 50%.
IQR Calculator tool
Enter numbers separated by commas, spaces, or line breaks.
Result will appear here.
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Privacy: calculations run locally in your browser. No values are stored or transmitted.
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.