PCB Trace Width & Current Capacity Calculator
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Electrical & Electronics

PCB Trace Width & Current Capacity Calculator

Estimate PCB trace width or current capacity, with copper thickness, resistance, voltage drop and power loss.

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Your inputs

1 oz/ft² ≈ 35 µm

IPC-2221 estimate for uniform copper. Copper weight uses 1 oz/ft² ≈ 35 µm. Resistance and losses use 20 °C, not the heated trace temperature. Planes, vias, airflow and manufacturing tolerances are not modeled; verify your board design.

IPC-2221 · TI SNVA766 §11

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Your results

Trace width
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Current capacity estimate
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Copper cross-section
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Resistance · 20 °C
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Voltage drop · 20 °C
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Trace power loss · 20 °C
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Formula—

How to use this tool

  1. Calculation · Copper layer · Copper thickness
  2. Current · Trace width · Temperature rise · Trace length
  3. Your results · Formula · Print results