PCB Trace Width Calculator

This tool uses formulas from IPC-2221 to calculate the width of a copper printed circuit board conductor or "trace" required to carry a given current while keeping the resulting increase in trace temperature below a specified limit. If the length of the trace is also provided, the total resistance, voltage drop, and power loss due to trace resistance are also calculated. The results are estimates; actual results may vary depending on application conditions. Note also that required widths are significantly higher for traces on internal layers of a circuit board compared to those on a board’s outer surface; use whichever result is appropriate for your situation.