This percentile calculator finds the value below which a chosen share of your data falls, using sorted-list interpolation.
Statistics
Percentile Calculator
Find the percentile rank or value in a data set.
Calculator
About this calculator
Formula notes
Sort the values; the p-th percentile position is (p/100)·(n−1), interpolated between neighboring ranks.
Worked examples
- Example: in 10, 20, 30, 40 the 50th percentile (median) is 25.
- In the ordered data 10, 20, 30, 40, 50, the 25th percentile is 20 under one common linear-interpolation convention.
How to use it
- Enter the data list and the percentile you want.
- Check the rank position used.
- Read the interpolated percentile value.
Frequently asked questions
Is the 50th percentile always the median?
Yes, they are the same concept; interpolation can make the numeric method differ slightly across tools.
Why do different tools give slightly different percentiles?
There are several accepted interpolation conventions for positions between data points.
Limits and interpretation
- Statistical packages use several percentile definitions, so small datasets can produce different values across methods.
- Percentile rank describes relative position in the supplied data and does not imply a probability model or population norm.