The Prisoner Capacity tells you how many prisoners you can hold in your prison. Normal Cells can always hold only 1 prisoner. The number of prisoners a Dormitory or a Holding Cell can hold depends on...
- The number of beds in the room.
- The number of tiles, divided by 4.
For example, a 3x4 Dormitory with 4 beds can only hold 3 prisoners, and a 10x10 dormitory with 10 beds can hold 10 prisoners.