1. Sign in to dropbox.com.
2. Go to https://www.dropbox.com/account/plan
3. The bar shows your Dropbox space usage and quota. The default MIT Dropbox quota is 10TB for faculty, 1TB for Spring 2020 teaching assistants, and 500 GB for all others.
http://kb.mit.edu/confluence/pages/viewpage.action?pageId=159384378