Oct 10, 2017 Solved: Hi all! I have great news! The long waited request for the ability to see folder sizes on web (dropbox.com) is now live! To enable - 246410. You want to remove as much unused or unneeded data as you can, and you likely want to start by removing the largest files or folders first. But currently, you cannot see the size of a specific file or folder, but only the total space occupied by your files. OneDrive (currently SkyDrive) is built in to the latest version of Windows. Learn how to get started. If you have an older version, you can install OneDrive and automatically sync the files in your OneDrive folder across your devices.
I'm not sure why the mod disallowed me from answering this question as I have the required rep, but I'll provide a comment: It's not an exact answer as it's not folder sizes, but will help you find large files. If you hover over the quota in the lower left of the screen on the web app, it will show your quota and a small blue 'i' icon. Click that and it will reverse sort all your files by largest to smallest. Hope this helps somewhat, and it's annoying that Google doesn't provide a real folder size.–Sep 29 '15 at 14:58. @user56353 PCs will sometimes report the disk space used.
Disk space is allocated in whole blocks, like 4k in size, and if a file is only 1k, it still uses 4k on disk. Thousands of small files could use up lots of wasted space. Google Drive might report only actual file size. Also Google Drive may compress photos & videos, or de-duplicate files between users if they are the same file. Check actual file size vs. Size on disk. Windows 8.1 reports both in File Properties ( ALT+ENTER).–Sep 29 '17 at 17:20.
Since there are no (currently working) answers here, I will post an answer that is slighly inconvenient, but at least it works, as long as the folder is less than 15 GB (the free storage amount offered by Google Drive).Create a new Google account, (this is not a very long process, thankfully) and share the folder with that account. On the new account, copy the shared folder so that it is also on that account.
Your new Google account will tell you how much storage you have used. That is the size of the folder. After getting that information, you can delete the whole folder.
This whole proccess can be done in a few minutes.