Die Size From Gate Count Calculator
Work out die size from gate count instantly with clear inputs, formula shown and shareable results.
About Die Size From Gate Count Calculator
Core area is gate count times area per gate divided by placement utilisation, then inflated for power rings, memories and margin. The result must be checked against the pad-limited size: if the die perimeter cannot host the required IO at the available pitch, IO count sets the die size instead of logic.
Formula
Die area estimate
core area = gates x gate area / utilisation; compare with pad-limited area = (pads x pitch / 4)^2
Worked example
With the default values below, Die Size From Gate Count Calculator returns Estimated die area of 51.84. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Gate count
- 25 Mgates
- Area per gate
- 0.35 µm²
- Placement utilisation
- 72 %
- IO pads required
- 480 pads
Results
- Estimated die area
- 51.84 mm²
- Core logic area
- 8.75 mm²
- Square die side
- 3.82 mm
- Pad-limited side
- 7.20 mm
Step by step
- 1Values used
- 2Die area estimate
- 3Estimated die area= 51.84 mm²
- 4Core logic area= 8.75 mm²
- 5Square die side= 3.82 mm
- 6Pad-limited side= 7.20 mm
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What is a pad-limited die?
One where the perimeter needed for bond pads exceeds what the logic requires, leaving wasted silicon. Area-array flip-chip bumping avoids this.
What utilisation is realistic?
65-80% for standard cell placement. Higher makes routing congested; lower wastes area.
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