PCB Trace Current Capacity Calculator (IPC-2221) | PCBark

PCB Trace Current Capacity Calculator

Estimate how much current a copper trace carries for a given temperature rise, using the IPC-2221 model. Handy when sizing power traces on industrial control and motor-drive boards.

Copper weight

Trace width (mil)

Allowed temp rise (°C)

Layer

Estimated current capacity

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Formula: I = k × ΔT^0.44 × A^0.725 (IPC-2221), where A is trace cross-section in mil² and copper thickness = weight × 1.378 mil. Estimate only — final ampacity depends on stack-up, adjacent copper and ambient. PCBark verifies power traces during DFM.

PCB Trace Current Capacity Calculator

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