5 Ways To Get Week Number Of Month In Excel

Understanding the Importance of Week Numbers in Excel

In many industries, such as finance, marketing, and sales, tracking and analyzing data by week is crucial for making informed decisions. However, Microsoft Excel does not have a built-in function to calculate the week number of a month. Fortunately, there are several ways to get the week number of a month in Excel.

Method 1: Using the WEEKNUM Function

The WEEKNUM function is the most straightforward way to get the week number of a month. However, this function returns the week number of the year, not the month. To get the week number of a month, we need to subtract the week number of the first day of the month from the week number of the date.

The formula is: =WEEKNUM(A1)-WEEKNUM(DATE(YEAR(A1),MONTH(A1),1))+1

How the Formula Works

• A1 is the date for which we want to get the week number of the month.
• WEEKNUM(A1) returns the week number of the year.
• DATE(YEAR(A1),MONTH(A1),1) returns the first day of the month.
• WEEKNUM(DATE(YEAR(A1),MONTH(A1),1)) returns the week number of the first day of the month.
• Subtracting the two week numbers and adding 1 gives us the week number of the month.

Method 2: Using the WEEKDAY Function

Another way to get the week number of a month is by using the WEEKDAY function. This function returns the day of the week (1 = Sunday, 2 = Monday,..., 7 = Saturday). We can use this function to calculate the week number of the month.

The formula is: =(DAY(A1)-WEEKDAY(DATE(YEAR(A1),MONTH(A1),1))+6)/7+1

How the Formula Works

• A1 is the date for which we want to get the week number of the month.
• DAY(A1) returns the day of the month.
• WEEKDAY(DATE(YEAR(A1),MONTH(A1),1)) returns the day of the week of the first day of the month.
• Subtracting the two values and adding 6 gives us the number of days from the first day of the month to the date.
• Dividing by 7 and adding 1 gives us the week number of the month.

Method 3: Using the INT and DAY Functions

This method uses the INT and DAY functions to calculate the week number of the month.

The formula is: =INT((DAY(A1)-1)/7)+1

How the Formula Works

• A1 is the date for which we want to get the week number of the month.
• DAY(A1) returns the day of the month.
• Subtracting 1 from the day of the month gives us the number of days from the beginning of the month to the date.
• Dividing by 7 and using the INT function gives us the number of complete weeks.
• Adding 1 gives us the week number of the month.

Method 4: Using a User-Defined Function (UDF)

If you need to calculate the week number of a month frequently, you can create a User-Defined Function (UDF) in VBA.

Here is an example of a UDF:

Function WeekNumberOfMonth(dtDate As Date) As Integer
  WeekNumberOfMonth = (Day(dtDate) - Weekday(DateSerial(Year(dtDate), Month(dtDate), 1)) + 6) / 7 + 1
End Function

You can then use this UDF in your worksheet: =WeekNumberOfMonth(A1)

Method 5: Using a Third-Party Add-in

There are several third-party add-ins available that can calculate the week number of a month. These add-ins often provide additional functionality and can be useful if you need to perform this calculation frequently.

One such add-in is ASAP Utilities, which provides a function called "Week number in month".

Gallery of Week Number Calculations in Excel

Week Number Calculations in Excel

In conclusion, calculating the week number of a month in Excel can be done using various methods, including the WEEKNUM function, WEEKDAY function, INT and DAY functions, User-Defined Functions (UDFs), and third-party add-ins. Each method has its own advantages and disadvantages, and the choice of method depends on the specific requirements of your worksheet.