Percentile* *is a value on a scale of 100 that indicates the percent of a distribution that is equal to or below it.

Percentiles are useful as they can tell you how one value compares to other values in the data set.

**Formula to calculate percentile in excel.**

Just like other functions, the percentile function can be found in excel.

There are three types of percentile functions in excel;

- =PERCENTILE. This one returns the kth percentile of values in a range.
- =PERCENTILE.EXC This one returns the kth percentile of values in a range, where k is in the range 0..1, exclusive.
- PERCENTILE.INC. This one returns the kth percentile of values in a range, where k is in the range 0..1, inclusive.

**Example:**

Calculate the 90th percentile of the following students scores in mathematics.

Name | Score out of 100. |

Mike | 70 |

Archie | 30 |

Hermione | 40 |

Hiram | 50 |

Becky | 91 |

Therefore, we begin by transferring the data to an excel spreadsheet.

We are going to use =PERCENTILE function to get the 90th percentile.

Since the k value in excel runs form 0 to 1, we are going to convert 90% to 0.9.

Array is the number of values you are going to calculate percentile from.

Therefore, this means that 90% of the scores are lower or equal to 82.6.