The **SUMPRODUCT function** is to return the sum of the products of corresponding ranges or arrays. It can sum the numbers in a certain year, a month, or a day. The following example is to sum numbers in a month and year, e.g., November 1994.

**Example:** You are working with a dataset with the product name in column A, the date sold in column B, and the amount sold in column C.

**Formula 1: **To count the total number of products sold in June 1993

=SUMPRODUCT( --(YEAR(B2:B12)=1993),--(MONTH(B2:B12)=6),C2:C12)

(YEAR(B2:B12)=1993): if the year is 1993, it returns true, otherwise false;

(MONTH(B2:B12)=6): if the month is 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 2,935, and 2,935 products were sold in June 1993.

**Formula 2: **To count the total number of products sold in November 1994

=SUMPRODUCT( --(YEAR(B2:B12)=1994), --(MONTH(B2:B12)=11),C2:C12)

The result returns 2,561, and 2,561 products were sold in November 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.