The USDA gives 2.5 sq ft coop space per bird. I don't know if they have a run guide. This site generally goes with 4 sq ft in the coop and 10 sq ft in the run. So using this sites numbers you have the room for 27 in the coop and 51 in the run. The numbers a elastic and the flock can do well on different amounts space. In some ways its trial and error