Interquartile Range Calculator
Calculate the interquartile range as Q3 minus Q1 using the median-of-halves quartile convention.
About this tool
Calculate the interquartile range as Q3 minus Q1 using the median-of-halves quartile convention. Enter finite values in the format shown in the examples and run the calculation. This utility works locally in your browser and does not upload your data. Statistical conventions, such as the quartile method or population versus sample denominator, are stated on this page to make results interpretable. Validate the assumptions of your dataset before applying a summary statistic to decisions.
How to use this tool
- Enter the data values in the labeled fields.
- Review the method and dataset assumptions.
- Calculate and interpret the result in context.
How it works
Interquartile Range Calculator validates the supplied observations and applies its documented statistical definition.
When to use this tool
- Exploring a small dataset or checking a worked example.
- Preparing summary statistics for an analysis or report.
Limitations
The descriptive calculations in Interquartile Range Calculator do not establish causation or determine whether a statistical model is appropriate for a particular dataset.
Privacy
The numeric inputs in Interquartile Range Calculator remain in browser memory and are not uploaded by this tool.