Percentile is a measure of statistics which indicates the value below which the given percentage of observations fall for a given data set. The 100th percentile is defined to be the largest value in the ordered list and the median is the 50th percentile. Given here is the 65th percentile formula which guides you to calculate the 65th percentile below which 65% of the observations fall for a data. Percentile is also sometimes referred to as centile.