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Electronics
Trace Width Calculator
Calculate required PCB trace width based on current capacity and temperature rise according to IPC-2221 standards.
Parameters
A
oz/ft²
°C
°C
in
Calculations based on IPC-2221 standards. Constants derived from curve fitting to standard charts.
External Layers (Air)
Min Trace Width
11.83mils
0.300 mm
Resistance0.4294 Ω
Drop0.4294 V
Loss0.429 W
Internal Layers
Min Trace Width
30.76mils
0.781 mm
Resistance0.1651 Ω
Drop0.1651 V
Loss0.165 W
Formulas & Notes
Area[mils²] = (Current[Amps] / (k * TempRise[°C]^b))^(1/c)
Width[mils] = Area[mils²] / (Thickness[oz] * 1.378)
Internal: k=0.024, b=0.44, c=0.725
External: k=0.048, b=0.44, c=0.725