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 |
|---|
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
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 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.