PCB trace width calculator by current (Excel)
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PCB trace width calculator by current (Excel)

Excel calculator for PCB trace width by current, temperature rise, copper thickness, external or internal layer per IPC-2221. Includes a quick lookup table, free.

Downloadable files

  • do-rong-duong-mach-ipc2221.xlsx
    Excel, with IPC-2221 formulas · 6 KB    Download

License CC BY 4.0 — free to use, credit “OctaX.one”. Demo the production version requires a free account to download.

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  • Enter the current, allowed temperature rise and copper thickness (oz), then choose external or internal layer.
  • Automatically calculates copper cross-section area and minimum width in mil and mm, with a quick lookup table from 0,5 to 10 A.
  • Example: 1 A, 10 °C rise, 1 oz copper, external layer needs a trace of about 0,30 mm.

IPC-2221 is an approximation. For multilayer boards, high currents or hot environments, also check against IPC-2152 and leave a safety margin.

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