I'm planning on applying to a bs/md program as the class of 2021
I had wrong info please disregard
Very few schools publish acceptance rates for their BS/MD programs. Of the ones that do, they're usually in the low single digits. For example, Brown's is ~4%; Northwestern's is ~2%, and it's not particularly different for schools like RPI, SUNY Stony Brook, or the University of Rochester. The programs are so small that their acceptance rates aren't really useful for gauging competitiveness in any way.
They will, on the flipside, usually tell you what the average GPA, SAT score, etc. are for their programs. For Stony Brook, for instance, they say their admitted students average a 1490-1590 SAT composite and have 98-99 high school GPAs on a 100pt scale (that's a 4.0 on a normal scale). The quick version of that is that BS/MD programs, even at state schools, are basically the most competitive programs you can apply for. What that means is that you should apply for as many as you can reasonably finish, because applying to these programs is more like punching a lottery ticket than anything else.
To keep this community safe and supportive: