Percentile Calculator
Find the value at any percentile and the quartiles of a data set.
Results update as you type.
About this calculator
A percentile is the value below which a given percentage of the data falls — the 90th percentile is the point beneath which 90% of the values lie. This calculator uses the linear-interpolation method (the same as spreadsheet PERCENTILE.INC): it ranks the sorted data and interpolates between neighbouring points. It also returns the first quartile (25th), median (50th) and third quartile (75th) percentiles.
Frequently asked questions
How is a percentile calculated?
The data is sorted and a rank of (p/100)·(n − 1) is computed. If that rank is a whole number the value at that position is returned; otherwise the calculator interpolates linearly between the two neighbouring values. This is the inclusive (PERCENTILE.INC) method.
What is the difference between a percentile and a quartile?
Quartiles are just specific percentiles that split the data into four equal parts: the first quartile is the 25th percentile, the second is the 50th (the median) and the third is the 75th percentile.
Results are estimates for general guidance only, not financial, medical or tax advice.