To begin calculating the size of a BIM360 project simply visit https://sizemyhub.matterlab.co/ and log in using your BIM360 credentials.
Enter your BIM360 email and password to sign in. Check the "Remember me" box to stay logged in.
SizeMyHub will then request permission to read your project data in order to successfully run.
Once you accept the authorisation, you will be granted access to SizeMyHub.