IQR Outlier Calculator
Calculate iqr outlier with explicit inputs and a worked example.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- R-7 quartiles and the 1.5 IQR rule. A flagged observation is not automatically an error.
Example Calculation
- Data: 1, 2, 3, 4, 100
For 1,2,3,4,100, the fences are −1 and 7; 100 is flagged.
Frequently asked questions
How do I use this calculator?
Enter data. The result updates automatically. Use Reset to restore the example values.
What method does it use?
Flag values below Q1−1.5×IQR or above Q3+1.5×IQR.. R-7 quartiles and the 1.5 IQR rule. A flagged observation is not automatically an error.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.