If you want to check how many number of the cells on your worksheet are used currently? 5 mils cells limit per sheet, including blank cells which are count as “used” even without no data, in case you have concern you may hit this limit where you no longer add data into it.
Looks an easy and instant add-on to check the latest status.
https://gsuite.google.com/marketplace/app/size_my_sheet/391759237464?pann=cwsdp&hl=en-GB
I believe @Kirk_Masden had once mentioned this. He should also have a post for that as well.
It was me
Do apologize @Fabian, it’s my bad…
I remember @Fabian’s original post. Great tip! Wish I could take credit for it.