Example 1
First Quartile (Q1): 25; Third Quartile (Q3): 75
Interquartile Range (IQR): 50; Upper Fence (Q3 + 1.5 * IQR): 150; Lower Fence (Q1 - 1.5 * IQR): -50
Outlier Calculator
Statistics0.0(0)
Identifies potential outliers in a dataset using the IQR * 1.5 rule (calculating fences).
More tools:Math & Statistics Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter First Quartile (Q1) and Third Quartile (Q3) in the units shown.
Step 2
Read Interquartile Range (IQR), Upper Fence (Q3 + 1.5 * IQR), and Lower Fence (Q1 - 1.5 * IQR) in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Example 2
First Quartile (Q1): 10; Third Quartile (Q3): 90
Interquartile Range (IQR): 80; Upper Fence (Q3 + 1.5 * IQR): 210; Lower Fence (Q1 - 1.5 * IQR): -110
Example 3
First Quartile (Q1): 50; Third Quartile (Q3): 75
Interquartile Range (IQR): 25; Upper Fence (Q3 + 1.5 * IQR): 112.5; Lower Fence (Q1 - 1.5 * IQR): 12.5
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