Every Google account comes with the free storage of 15 GB.
If you want to check how much of your Google account storage quota is used by your Gmail account, then follow any one of the below ways:
Click this link (Sign in if not already), and you can find the answer.
In our instance (see above screenshot), you can see that my Gmail account has taken up the storage of 0.11 GB.
You can do the same task using this alternative way on Android:
Open Google Drive for Android.
Hit "Hamburger" icon (three vertical lines) > Storage.
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How to Check Storage Usage of Gmail