Google Sheet allows you to have 5 Million Cells.
This Add On shows you how many Cells your Sheet has.
It even shows you the largest sheet.
https://gsuite.google.com/marketplace/app/size_my_sheet/391759237464
As you see - I can continue to use my App for a long time
This helped me reduce the size of one of my sheets significantly. Thanks!
The maximum number of cells in Google Sheet will be extended from 5 million to 10 million. ๐
Thanks Fabian!