For anyone trying to do this math, in the US, you need to reduce the equivalent pay by about 10-15% for self-employment tax if you're 1099. It's more useful to start with 1500 hours a year, as well, if you're truly contracting (not "full time paid as a contractor for one client") since you'll need to find new contracts and that will take up a surprising amount of your time.
I sometimes joke that, when contracting, I spend 80% of my time billing work for client projects and the other 80% (unpaid) getting new projects, leaving me only 80% (unpaid) of my time to spend managing relationships with clients and collaborators, doing taxes, and maintaining the existing business.