Often you may want to sum the values of some dataset in Excel based on month.

For example, suppose we have the following dataset and we’d like to sum the total sales by month:

The following step-by-step example shows how to do so.

**Step 1: Enter the Data**

First, enter the data values into Excel:

**Step 2: Extract the Month from Dates**

Next, we need to use the **=MONTH()** function to extract the month from each date.

In our example, we’ll type the following formula in cell **D2**:

=MONTH(A2)

We’ll then drag and fill this formula down to every remaining cell in column D:

**Step 3: Find the Unique Months**

Next, we need to use the **=UNIQUE()** function to produce a list of unique months.

In our example, we’ll type the following formula in cell **F2**:

=UNIQUE(D2:D10)

This will produce a list of unique months:

**Step 4: Find the Sum by Month**

Next, we will use the **SUMIF(range, criterion, sum_range)** function to find the sum of the sales made during each month.

In our example, we’ll type the following formula in cell **G2**:

=SUMIF($D$2:$D$10, F2, $B$2:$B$10)

We’ll then drag and fill this formula down to the remaining cells in column G:

This tells us:

- There were
**117**total sales made in January. - There were
**50**total sales made in February. - There were
**111**total sales made in March.

**Additional Resources**

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

How to Calculate a Five Number Summary in Excel

How to Sum Across Multiple Sheets in Excel

How to Count by Group in Excel