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Bowley Quartile Skewness

Assess robust asymmetry using the lower quartile, median, and upper quartile.

Statistics workspace● Runs in your browser
01 Your input
02 Your result
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FormulaSkewness = (q3+q1-2*q2)/(q3-q1); Interquartile Range = q3-q1
Sources and model references

Made for real tasks

  • Assess robust asymmetry using the lower quartile, median, and upper quartile.
Explore step-by-step workflows →

Worked example

Inputs

Lower quartile
10 number
Median
12 number
Upper quartile
18 number

Expected results

Skewness
0.5 number
Interquartile Range
8 number

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter lower quartile, median, upper quartile.
  2. Use the displayed units and confirm the model assumptions.
  3. Calculate and compare the outputs against your input scenario.

Try this example

{
  "q1": 10,
  "q2": 12,
  "q3": 18
}

Accuracy and scope

Quartile definitions differ across software; use a consistent method. This does not compute quartiles from raw data.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.