How to Count Cells on a Weekday

To count the number of cells on a weekday, you can use the SUMPRODUCT and WEEKDAY functions.

Example: You are working with a worksheet with the first name in column A, the last name in column B, the date of appointment in column C, and weekdays in column D.

Question: How many appointments are on Friday?

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

=SUMPRODUCT((WEEKDAY(C2:C12)=6)*1)

The result returns 3, so three appointments are on Friday. 

Explanation: 

  • Step 1: WEEKDAY(C2:C12): The result returns the day of the week for each date;
  • Step 2: (WEEKDAY(C2:C12)=6): The result returns TRUE if the date is a Friday, or FALSE if not;
  • Step 3: The hyphen (or times one) converts TRUE into one and FALSE into zero;
  • Step 4: The SUMPRODUCT function returns the sum of the products of the new array.

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.

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