This tutorial provides a step-by-step example of how to create the following cumulative sum chart in Excel:

Let’s jump in!

**Step 1: Enter the Data**

First, let’s create the following dataset that shows the total sales of some item during each month in a year:

**Step 2: Calculate the Cumulative Sum**

Next, we’ll use the following formula to calculate the cumulative sum of sales:

=SUM($B$2:B2)

We can type this formula into cell **C2** and then copy and paste it to every remaining cell in column C:

**Step 3: Create Bar Chart with Average Line**

Next, highlight the cell range **A1:C13**, then click the **Insert** tab along the top ribbon, then click **Clustered Column** within the **Charts** group.

The following chart will be created:

Next, right click anywhere on the chart and then click **Change Chart Type**:

In the new window that appears, click **Combo** and then click **OK**:

The chart will be converted into a bar chart with a line:

The blue bars represent the sales each month and the orange line represents the cumulative sales.

**Step 4: Customize the Chart (Optional)**

Feel free to add a title, customize the colors, customize the line style, and adjust the width of the bars to make the plot more aesthetically pleasing:

**Additional Resources**

The following tutorials explain how to perform other common tasks in Excel:

How to Fit a Curve in Excel

How to Make a Frequency Polygon in Excel

How to Add a Horizontal Line to Scatterplot in Excel