Calculating the Number of Weeks Between Dates in Excel on Windows 11

Calculating the number of weeks between two dates in Excel on Windows 11 is a handy skill. You simply need to input the start and end dates into separate cells, then use a formula to calculate the difference in weeks. This can be useful for project planning, tracking milestones, or counting down to a special event.

Step by Step Tutorial: Calculating the Number of Weeks Between Dates in Excel

Before diving into the steps, let’s understand what we are about to do. We will be using Excel’s built-in functions to determine the number of weeks that lie between two specific dates. This can be achieved by subtracting the start date from the end date and then dividing the result by 7 to convert the days into weeks.

Step 1: Enter the Start and End Dates

Enter your start date in one cell and your end date in another cell.
It’s important to make sure that Excel recognizes these cells as dates. You can do this by formatting the cells as a date in the ‘Number’ group on the ‘Home’ tab.

Step 2: Use the DATEDIF Function

In a new cell, type the formula =DATEDIF(start_date, end_date, “d”)/7.
DATEDIF is a somewhat hidden function in Excel that calculates the difference between two dates. The “d” signifies that we want the difference in terms of days, which we then divide by 7 to get weeks.

Step 3: Press Enter to Get the Result

After entering the formula, press Enter, and the number of weeks will appear in the cell.
If the result is not a whole number, you can round it to the nearest whole number by using the ROUND function in your formula.

Once you’ve completed these steps, you’ll have the number of weeks between the two dates displayed in your chosen cell.

Tips: Calculating the Number of Weeks Between Dates in Excel

  • Make sure your date cells are formatted correctly; otherwise, Excel may not recognize them as dates.
  • If you want to include the start date as a full week, you might add 1 to the result.
  • To avoid errors, always double-check that your start date is earlier than your end date.
  • If you want to calculate the number of workweeks, you might need to adjust the formula to account for weekends.
  • Remember that Excel’s week starts on Sunday by default unless you change the settings.

Frequently Asked Questions

Can I calculate the number of weeks between dates in Excel on a Mac?

Yes, the steps and functions are the same in Excel on a Mac as they are in Excel on Windows 11.

What if I want to calculate in business weeks?

You can modify the formula to exclude weekends by using the NETWORKDAYS function instead of DATEDIF.

How do I account for holidays when calculating weeks?

You can use the NETWORKDAYS.INTL function and specify the dates of holidays to exclude them from the calculation.

Can I round up to the nearest whole week?

Yes, use the CEILING function in your formula to round up to the nearest whole number.

What if Excel doesn’t recognize my dates?

Ensure that the dates are entered in a format that Excel can understand, such as mm/dd/yyyy, and that the cells are formatted as ‘Date’.


  1. Enter the start and end dates in separate cells.
  2. Use the DATEDIF function and divide by 7 in a new cell.
  3. Press Enter to get the result.


Calculating the number of weeks between dates in Excel on Windows 11 is a breeze once you know the right formula. Whether you’re planning for the future or reflecting on the past, Excel can help you measure time in a way that’s useful for your specific needs. Remember that context is vital – are you counting every single day, or just workdays? Are holidays a factor? Tailor your formula accordingly. And don’t forget to check that those pesky date formats are in line with Excel’s requirements! With a little practice and attention to detail, you’ll be an Excel date-calculating pro in no time. So go ahead, give it a try and watch as those rows and columns obediently yield the insights you need with just a few clicks.

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