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Trace Width
IPC-2221 charts — solve for required width or a trace's current capacity
Show your work
Solve for
Layer
Required width
30.8 mil
Required width
0.781 mm
Cross-section
42.4 mil²
Resistance
32.1 mΩ
Voltage drop
64.1 mV
Dissipation
128 mW
IPC-2221 is a conservative DC estimate for a bare trace in still air. Internal layers derate to roughly half the external current for the same geometry. Add margin for long runs, adjacent heat sources, and pulsed loads.