HELP ME OUT: Here's

HELP ME OUT: Here's a little problem to chew on if you're feeling clever tonight.

1000 == 7
101 == 10
110 == 15
200 == 25
10010 == 33

So...

1000001 == ?
21 == ?
112 == ?
120 == ?
1011 == ?

If you can describe your thought process after you get it, that would be helpful as well. People might put the answers in the comments, so don't go there until you finish your own work!