Quartile Calculator
Calculate quartiles Q1, Q2, Q3, interquartile range (IQR), and a sorted summary from a dataset.
Enter values separated by commas, spaces, or line breaks.
This calculator returns:
Q1, Q2 (median), Q3, and IQR = Q3 − Q1
| Metric | Value |
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Privacy: calculations run locally in your browser. No inputs are stored or transmitted.
How it works
The data is sorted first. Then:
Q2 is the median,
Q1 is the median of the lower half,
and Q3 is the median of the upper half.
Examples
- 5, 7, 8, 11, 13, 16, 20
- Q2 = median = 11
- Q1 = 7, Q3 = 16, IQR = 9
FAQ
- What are quartiles?
Quartiles divide sorted data into four parts. Q1 is the first quartile, Q2 is the median, and Q3 is the third quartile.
- What is IQR?
IQR stands for interquartile range and is calculated as Q3 − Q1.
- How does this calculator split the data?
This page uses the median-of-halves method on the sorted dataset.
- How should I enter the data?
Enter values separated by commas, spaces, or line breaks.
- Are calculations stored?
No. Everything runs locally in your browser.