PCB Trace Width Calculator

Calculate the required trace width for your PCB design based on current, copper weight, and acceptable temperature rise using IPC-2221 standards.

Calculate Trace Width

IPC-2221 Formula

A = (I / (k × ΔT^b))^(1/c)
  • A: Cross-sectional area (mils²)
  • I: Current (Amperes)
  • ΔT: Temperature rise (°C)
  • k, b, c: Constants based on layer type

Common Trace Widths

Current (A)1 oz Copper (mils)2 oz Copper (mils)20°C Rise
0.5A3.01.5External
1A7.83.9External
2A20.310.2External
3A35.517.8External
5A71.936.0External
10A187.193.5External

Note: This calculator provides theoretical values based on IPC-2221 standards. Always consult with your PCB manufacturer and consider additional safety margins.