I am looking to find the easiest way to count all of the tasks that I have across all 100 of my sheets. Would the COUNTIF and referencing sheets be the best way to go about this?



That seems like it would be the most effective way to me.


Just keep in mind that each cell can only hold 4,000 characters including spaces. Depending on your sheet names and whatnot, having 100 of them could cap that out. Then you would have to break it down to reference a set amount of sheets across multiple cells then use another cell to total all of those.

Do you need a COUNT value to display on a Dashboard, or are you simply looking to have an indication? If you're only looking for ballpark, you could create a Report that references all your task sheets and simply apply criteria that pulls tasks out.