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Outlier Calculator

Result

Calculated result Q1: 1.5 | Q3: 12 | IQR: 10.5 | Lower fence: -14.25 | Upper fence: 27.75 | Outliers: [None] Based on the values entered.
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Outlier Calculator — free online calculator.

Formula

Method: Compute Q1 and Q3 with the runtime five-value quartile rule, IQR = Q3−Q1, fences Q1−1.5·IQR and Q3+1.5·IQR, then flag values outside the fences.
  • Outlier Calculator calculates its result from v1, v2, v3, v4, v5. It uses the formula Calculated with the verified ST Calculator runtime.. Change any input to recalculate the result instantly.
  • The main inputs are v1, v2, v3, v4, v5. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Outlier

Inputs
  • v1: 1
  • v2: 2
  • v3: 3
  • v4: 4
  • v5: 20

Using v1 = 1, v2 = 2, v3 = 3, v4 = 4, v5 = 20, the calculated result is Q1: 1.5 | Q3: 12 | IQR: 10.5 | Lower fence: -14.25 | Upper fence: 27.75 | Outliers: [None].

Sample result: Calculating…

Frequently asked questions

What does the Outlier calculate?

Outlier Calculator — free online calculator.

Which values should I enter?

Enter v1, v2, v3, v4, v5 using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Method: Compute Q1 and Q3 with the runtime five-value quartile rule, IQR = Q3−Q1, fences Q1−1.5·IQR and Q3+1.5·IQR, then flag values outside the fences..

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026