How To Calculate Percentile


To Calculate (for the purpose of this guide, we will use Pth percentile), follow these steps;

  • If not in ascending order, rearrange the measurements in ascending order.
  • Compute the index; i = (P / 100)*N where P is the percentile you are looking for, and N equals the number of your measurements, and i is the index or position of the percentile that you are looking for.
  • 1) If ‘i’ is not an integer, round up to get the next integer that is greater than ‘i’. This integer is the position of the percentile in your ordered measurements.

    2) If ‘i’ is an integer, then the percentile you are looking for is the average of the measurements in positions i and i + 1 in your ordered measurements.


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