Compute required trace width from current, copper thickness, layer type, and allowable temperature rise. Optional voltage drop uses trace length & copper resistivity.
Inputs
DC or RMS current through the trace.
Typical design: 10–20°C on external layers.
IPC-2221 uses different constants for internal vs external traces.
1 oz ≈ 35 µm thickness (≈ 1.37 mil).
Optional: Voltage Drop / Power
Used to estimate resistance, voltage drop, and power at the calculated width.
Important: This calculator uses IPC-2221 empirical equations. Real-world trace temperature depends on PCB stackup, airflow, copper pours, vias, and nearby conductors.
Always validate with your fab/assembly guidelines and consider simulation or measurement for high-current designs.