basic

IQR & Outlier Fence Calculator

IQR = Q3 − Q1; fences = Q1−1.5×IQR and Q3+1.5×IQR.

Calculates the interquartile range (IQR), Tukey lower/upper fences for outlier detection, and box-plot summary from Q1, Q2, Q3.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

IQR = Q3−Q1; Lower = Q1−1.5×IQR; Upper = Q3+1.5×IQR

In depth

Calculates the interquartile range (IQR), Tukey lower/upper fences for outlier detection, and box-plot summary from Q1, Q2, Q3.