Determining a Name for a Week Number in Excel

Excel is a powerful tool that can help you organize and analyze data in a variety of ways. One of the features that makes Excel so useful is its ability to work with dates and times. With Excel, you can easily calculate the number of days between two dates, determine the day of the week for a particular date, and even calculate the week number for a given date. In this article, we will focus on how to determine a name for a week number in Excel.

What is a Week Number?

A week number is a number that represents the week of the year. In most countries, a week is defined as starting on Monday and ending on Sunday. However, some countries define a week as starting on Sunday and ending on Saturday. In Excel, you can use the WEEKNUM function to calculate the week number for a given date.

Using the WEEKNUM Function

The WEEKNUM function is a built-in function in Excel that returns the week number for a given date. The syntax for the WEEKNUM function is:


The serial_number argument is the date that you want to calculate the week number for. The return_type argument is optional and specifies the type of week numbering system to use. If you omit the return_type argument, Excel assumes that you want to use the default week numbering system, which is determined by the system settings on your computer.

There are several different week numbering systems that you can use with the WEEKNUM function. The most common week numbering systems are:

  • System 1: The week containing January 1st is the first week of the year.
  • System 2: The week containing the first Thursday of the year is the first week of the year.

To use the WEEKNUM function to determine a name for a week number, you can combine it with the CHOOSE function. The CHOOSE function allows you to specify a list of values and return the value at a specified index. Here’s an example:

=CHOOSE(WEEKNUM(A1),”Week 1″,”Week 2″,”Week 3″,”Week 4″,”Week 5″,”Week 6″,”Week 7″,”Week 8″,”Week 9″,”Week 10″,”Week 11″,”Week 12″,”Week 13″,”Week 14″,”Week 15″,”Week 16″,”Week 17″,”Week 18″,”Week 19″,”Week 20″,”Week 21″,”Week 22″,”Week 23″,”Week 24″,”Week 25″,”Week 26″,”Week 27″,”Week 28″,”Week 29″,”Week 30″,”Week 31″,”Week 32″,”Week 33″,”Week 34″,”Week 35″,”Week 36″,”Week 37″,”Week 38″,”Week 39″,”Week 40″,”Week 41″,”Week 42″,”Week 43″,”Week 44″,”Week 45″,”Week 46″,”Week 47″,”Week 48″,”Week 49″,”Week 50″,”Week 51″,”Week 52″,”Week 53″)

In this example, we’re using the WEEKNUM function to calculate the week number for the date in cell A1. We’re then using the CHOOSE function to return the name of the week based on the week number. If the week number is 1, the formula returns “Week 1”. If the week number is 2, the formula returns “Week 2”, and so on.


Determining a name for a week number in Excel is a simple process that can be accomplished using the WEEKNUM function and the CHOOSE function. By combining these two functions, you can easily create a formula that will return the name of the week based on the week number. Whether you’re using Excel for personal or professional purposes, this feature can be a valuable tool for organizing and analyzing your data.


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