🔌 PCB Trace Width Calculator

💡 About PCB Trace Width

PCB trace width calculations are based on the IPC-2221 standard. Current flowing through copper traces generates heat — too narrow a trace can overheat or burn out.

IPC-2221 Formula (Outer Layer)

I = k × ΔT^0.44 × A^0.725

Where: I=Current(A), ΔT=Temp rise(°C), A=Area(mil²), k=0.048 outer / 0.024 inner

Common Copper Weights

• 0.5 oz (17.5μm) - Lightweight PCBs
• 1 oz (35μm) - Standard PCBs
• 2 oz (70μm) - Power boards / high current
• 3 oz (105μm) - High-power applications

Design Tips

• Use at least 1.5× the calculated width for power traces
• Inner layers need wider traces for the same current
• High-frequency signals also require impedance matching