Die Per Wafer Console
A live instrument for the first number in every chip cost model. Drag the die size or wafer and the map re-plots instantly — counting only dies that fully fit inside the usable area after edge exclusion and kerf, with placement optimized across four offsets. Gross dies, yield, utilization and cost-per-die update in real time.
Drop in a die and wafer — get the count instantly.
Wafer-prober console
Same die across wafer sizes
A 9×9mm die (81 mm²) — the economy of scale of bigger wafers.
What die count drives
but you never get it all — edge exclusion and saw kerf shrink the usable area, which is why an exact grid count beats a back-of-envelope area divide.
cost-per-die ≈ wafer cost ÷ (dies × yield), and both terms worsen as dies grow. Shaving 10% off die area can cut cost-per-die by far more than 10%.
for well under 2.25× the cost — the economy of scale that drove the whole industry to 300mm and kept 450mm endlessly debated.
every die the grid places partly off the usable circle is silicon you paid to process and threw away. Bigger wafers shrink the edge-to-area ratio.
How the count is computed
usable R = Ø/2 − edge ; footprint = (w+kerf)(h+kerf)A die counts only if all four corners lie within R. The grid is tried in four half-shift placements; the best is reported.
- ≥88%Excellent utilization
- ≥80%Good utilization
- ≥65%Moderate utilization
- <65%Low utilization
DPW ≈ π·(d/2)²/S − π·d/√(2·S)The De Vries approximation: area divide minus an edge-loss term. Good for a sanity check; the grid count is the real answer.
Cost follows directly: cost/good die = wafer cost ÷ (dies × yield). Both fall as die area grows, so cost rises faster than area — the case for small dies and chiplets.
Why dies-per-wafer is the first number in every chip business case
Before a chip has a price, it has a die-per-wafer count. Everything downstream — gross margin, break-even volume, whether a product is even viable — starts from one geometric fact: how many copies of this design fit on one wafer. A foundry sells wafers, not chips, so the number of dies you harvest, times the fraction that work, is the bridge between what you pay and what you can sell.
The naive answer is wrong. Dividing a 300mm wafer's ~70,686 mm² by a die's area suggests more chips than you can ever get, because square dies can't tile a circle. Around the curved rim every die that pokes past the edge is discarded, and a ring is excluded outright because the process is unreliable there. The honest count comes from placing dies on a grid and counting only those that fully fit — exactly what this console does, optimizing placement the way a layout team would.
Two parameters move the number more than people expect. Edge exclusion removes dies precisely where the wafer is widest and holds the most positions. The kerf adds to every die's footprint — negligible for a large CPU die, a real tax on a tiny sensor die. Both make the count smaller than the textbook formula suggests, which is why the formula and the exact grid count sit side by side here.
The reason any of this matters is cost. Cost-per-good-die is wafer cost divided by dies-per-wafer times yield, and die area attacks both terms at once: a bigger die means fewer dies AND a higher chance each holds a killer defect. That double penalty is why a 20% area increase can raise cost-per-die by far more than 20%, and why chiplets can win on cost even after paying for advanced packaging. Use this console as step one, then layer on yield and cost with the Yield and Wafer Cost instruments.
Trusted by Fab, Fabless & ASIC Teams
“The live wafer map matches our internal DPW tool to within a die or two, and watching it redraw as I drag the die size is exactly the instrument I wanted. The placement optimization caught extra dies our first pass missed.”
“Watching dies-per-wafer collapse live as die size grows made the chiplet argument to my execs in seconds. This finally looks like the engineering instrument it should be, not a web form.”
“Clients ask 'how many chips per wafer?' and I have the answer with a picture in ten seconds, across 200/300/450mm. The formula cross-check next to the exact count is the credibility touch.”
“Taught me more about chip economics than any article — the live utilization gauge and the reality anchors connect die size to real money. Beautiful, fast, and genuinely useful.”
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Grid-placement method · De Vries formula cross-check · Last reviewed: 2026-06