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You may be saying is that you intend to have 4 breeder pens and each breeder pen will house 3 full-sized hens and 1 full-sized rooster. You have a 12 x 8 shed that will be cut up into coop sections.
The shed is 96 square feet / 4 = 24 square feet per pen / 4 chickens = 6 square feet per bird. In your climate you will have days the chickens probably won't spend much time in the run, so the 6 square feet is probably a good size. As Omran said, for 4 birds you need a minimum of 40 square feet for the run. More is always better.
Now, if you are saying you want to use the shed itself as the coop and run, you need to provide 14 square feet per bird (4 for the coop and 10 for the run) so 96 /14 = 6.8 birds. So if you are asking if this space is big enough for a total of 4 chickens, yes it is. You could divide it into 2 pens with 3 birds in each pen.
sorry it wasn't very clear but what i would do is separate the shed into 4 breeding pens and they would each have separate runs outside the shed. one of the pens would house 3 full sized hens and 1 full sized rooster. the others would house the rest of my 12 chicks. total i have 16 chicks in the brooder right now. Would my 12X8 be big enough to make 4 separate pens for 16 chicks if i put 4 in each one? How big shoud the pens be? How big should the outside runs be then for 4 chickens?