The best formula would be: (1/(Yield rate/100))*(FTF Target/ FTF Apps) where FTF = “first time freshmen” on the table.
The yield rate is the % of students who attend that are accepted. Cal Poly generally accepts 3x applicants than spots but the exact college yield rates vary from college to college and can be found here: http://content-calpoly-edu.s3.amazonaws.com/ir/1/publications_reports/infobrief/ib14adfl.pdf
Examples:
Mechanical engineering, 3,333 apps, 180 spots, 36.8% yield rate.
(1/0.368%)*(180/3333) = 14.68%
Computer Science: 3569 , 140 spots, 36.8% yield
(1/0.368)*(140/3569) = 10.63%
Biology: 4191 apps, 201 spots, 21.4% yield
(1/0.214)*(201/4191) = 22.41%
Business: 5833 apps, 605 spots, 31.1%
(1/0.311)*(605/5833) = 33.35%
Architecture 1119 apps , 160 spots , 51.6% yield
(1/0.516)*(160/1119) = 27.71%
Hope this helps!