Dies per wafer
Beginner
How many copies of a chip fit on one wafer, the thin round slice of silicon that chips are made on.
Novice
Roughly the area of the round wafer divided by the area of one chip, minus the partial chips lost around the curved edge. Smaller chips fit more copies and waste less at the edge.
Expert
A common estimate is for wafer diameter and die area . Real counts also subtract the scribe lanes (the gaps where the wafer is sawn), an unusable rim at the edge, and test structures.