Wafer dimension 
SoC area 
Possible SoCs per wafer 
Average yield 
Good SoCs per wafer 
wafer cost 
Cost per good SoC 
Cost per mm² 

Possible SoCs per wafer: This number depends on the wafer area and the area of the SoC. Dies on the edge of the wafer are removed.

Average Yield: this number depends on the process and the SoC area. Foundries usually provide this number.

Cost per mm²: this cost takes into account the price of the wafer, the area of the SoC and the yield.