Die per wafer (DPW) calculator
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KEY POINTS
The number of dies per wafer is always lower than the wafer area divided by the die area. Rectangular dies on a round wafer leave unusable space at the edge, and the edge exclusion zone and scribe lines (kerf) are also lost. This tool places dies on a grid using the wafer diameter, die size, scribe width and edge exclusion to count how many actually fit.
Inputs
Only dies whose four corners all fall inside the usable area are counted. The grid origin is tried at four positions, shifted by half a pitch in each direction, and the arrangement that fits the most dies is used. Real mask layouts add constraints per exposure shot, so production counts can be a few percent lower.
FAQ
What formula is used to estimate dies per wafer?
A common approximation is π·(d/2)²/S − π·d/√(2S), where d is the wafer diameter and S is the die area; the second term is the edge loss. This tool does not use the approximation but counts dies on an actual grid.
Why does a 300 mm wafer yield more than 2.25 times the dies of a 200 mm wafer?
The area ratio is 2.25, but edge loss is a smaller share of a larger wafer, so the ratio of die counts is usually higher than the area ratio.
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Last updated: October 23, 2026