To calculate the next Tuesday from a given date in Excel, use the following formula:

Here, A1 is the cell containing the date you want to start from.

How this formula works:

1. The WEEKDAY function returns a number representing the day of the week (1 for Sunday, 2 for Monday, and so on).
2. If the given date is on or before Tuesday (i.e., if WEEKDAY(A1) is 1, 2, or 3), then we add 3 minus the weekday number to the date to get the next Tuesday. For example, if the given date is a Monday (weekday number 2), we add 3-2=1 day to get to Tuesday. If the given date is a Sunday (weekday number 1), we add 3-1=2 days to get to Tuesday.
3. If the given date is after Tuesday (i.e., if WEEKDAY(A1) is 4, 5, 6, or 7), then we add 10 minus the weekday number to the date to get the next Tuesday. For example, if the given date is a Wednesday (weekday number 4), we add 10-4=6 days to get to the next Tuesday. If the given date is a Saturday (weekday number 7), we add 10-7=3 days to get to the next Tuesday.

Once you enter this formula in a cell, it will return the next Tuesday from the given date. You can then copy and paste the formula to other cells as needed.