Heavy Copper Trace Current Calculator

Estimate the current a trace can carry using the IPC-2221 relationship between copper weight, trace width, and temperature rise. For production design, PCBark verifies against IPC-2152.

Formula: I = k · ΔT^0.44 · A^0.725 (IPC-2221), where A is cross-section in mil². k = 0.048 outer / 0.024 inner. 1 oz ≈ 1.37 mil thickness. Inner-layer traces are derated to ~50% of outer. This is a planning estimate — request a PCBark DFM review for an IPC-2152-verified result.