Often you may want to calculate a cumulative percentage of some dataset. Fortunately this is easy to do using built-in functions in Excel.

The following step-by-step example shows how to calculate cumulative percentages in Excel.

**Step 1: Enter the Data**

First, let’s create a dataset that shows the number of units that some company sells during consecutive years:

**Step 2: Calculate Cumulative Frequency**

Next, let’s use the following formula to calculate the cumulative frequency of the first row:

We can then copy and paste this formula to each remaining cell in column C:

**Step 3: Calculate Cumulative Percentage**

Next, we can use the following formula to calculate the cumulative percentage of the first row:

We can then copy and paste this formula to the remaining cells in column D:

**Step 4: Change Formatting to Percentage**

Lastly, we can highlight each of the cumulative percentage values in column D and then press **Ctrl+Shift+%** to convert the formatting to percentages:

We interpret the cumulative percentages as follows:

- About
**6%**of all sales were made in year 1. - About
**13%**of all sales were made in years 1 and 2 combined. - About
**20%**of all sales were made in years 1, 2, and 3 combined.

And so on.

**Additional Resources**

How to Calculate Cumulative Frequency in Excel

How to Calculate a Cumulative Average in Excel

How to Calculate Moving Averages in Excel