The **SUMPRODUCT function** is to return the sum of the products of corresponding ranges or arrays. It can also count the cells in a certain year, a month, or a day. The following formula is to figure out the number of cells in a month (e.g., June).

**Example:** You are working with a dataset with the first name in column A, the last name in column B, and the DOB (date of birth) in column C.

**Formula 1: **To count the number of people that were born in June

=SUMPRODUCT(--(MONTH(C2:C12)=6))

MONTH(C2:C12)=6: if DOB is in June, it returns true, otherwise false;

The double hyphens (--) convert true into 1, and false into 0;

The SUMPRODUCT returns the sum of the products of the array.

The result returns 2, and two people were born in June.

**Formula 2: **To count the number of people that were born in November

=SUMPRODUCT(--(MONTH(C2:C12)=11))

The result returns 3, and three people were born in 1994.

**Notes: The SUMPRODUCT function**

The SUMPRODUCT function adds all the multiplication results for all arrays.

**Formula:**

=SUMPRODUCT(array1, [array2], …)

**Explanations:**

– Array1 is required, the first array is to multiply and then add.

– Array2 is optional, the second array is to multiply and then add.