IQR Outlier Fence Calculator
Calculate Tukey lower and upper outlier fences from quartiles and list observations outside those fences.
About this tool
Calculate Tukey lower and upper outlier fences from quartiles and list observations outside those fences. 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
IQR Outlier Fence 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 IQR Outlier Fence Calculator do not establish causation or determine whether a statistical model is appropriate for a particular dataset.
Privacy
The numeric inputs in IQR Outlier Fence Calculator remain in browser memory and are not uploaded by this tool.