## Summary

The Excel PERCENTOF function is designed to calculate the percentage of a subset of data with respect to all data. The output from PERCENTOF is a decimal number that can be formatted with Excel's percentage number format.

## Purpose

Return a subset of data as a percentage of all data

## Return value

A decimal value that represents the percentage

## Syntax

``=PERCENTOF(data_subset,all_data)``
• data_subset - A subset of data as a range or array.
• all_data - All data as a range or array.

## How to use

The PERCENTOF function is designed to return a subset of data as a percentage of a larger data set. The output from PERCENTOF is a decimal number that can be formatted with Excel's percentage number format. Essentially, PERCENTOF performs a calculation like this:

``=SUM(data_subset)/SUM(data_all)``

The result will be a decimal number that must be formatted as a percentage. For example, if the subset of data is 250 and the full set of data is 1000, PERCENTOF will return 0.25:

``=PERCENTOF(250,1000) // returns 0.25``

When 0.25 is formatted as a percentage, it will display as 25% on the worksheet.

### Worksheet Example

In the worksheet shown above, the formula in cell D5 looks like this:

``=PERCENTOF(C5,\$C\$5:\$C\$12)``

The result is 37% (0.37) since \$950 is 37% of the sum of the range C5:C12, which is \$2570. As the formula is copied down, it returns each value in column C5:C12 as a percentage of \$2570.

Although PERCENTOF will work fine on its own, it was originally introduced as a companion to the GROUPBY and PIVOTBY functions to provide a simple way to show data subsets as percentages in the output of these functions.

Author

### Dave Bruns

Hi - I'm Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.