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. It can also count the cells in a month and year (e.g., October 2020).
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: How many people were born in November 1998?
=COUNTIFS(C2:C12,">=11/1/1998",C2:C12,"<=11/30/1998")
The result returns 2, so two people were born in November 1998.
Alternatively, you can use the SUMPRODUCT function
Formula 2: How many people were born in November 1998?
=SUMPRODUCT(–(MONTH(C2:C12)=11), –(YEAR(C2:C12)=1998))
- Step 1: (MONTH(C2:C12)=11): if DOB is in November, it returns true, otherwise false;
- Step 2: (YEAR(C2:C12)=1998): if DOB was in 1998, it returns true, otherwise false;
- Step 3: The double hyphens (–) convert true into one and false into zero;
- Step 4: The SUMPRODUCT returns the sum of the products of the array.
The result returns 2, so two people were born in November 1998.
Formula 3: How many people were born in June 1990?
=SUMPRODUCT(–(MONTH(C2:C12)=6), –(YEAR(C2:C12)=1990))
The result returns 3, so three people were born in June 1990.
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 add.
– Array2 is optional; the second array is to multiply and add.
