Miscellaneous CalculatorsFree Tool

PCB Trace Current Calculator

Provided byOmni Calculatoromnicalculator.com

Are you trying to find the current capacity of your PCB trace? This is your place! The PCB trace current calculator w...

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Screenshot of PCB Trace Current Calculator on Omni Calculator
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About this tool

What PCB Trace Current Calculator does

The PCB Trace Current Calculator on Omni Calculator determines the maximum safe current a printed circuit board trace can carry based on its physical and environmental parameters. Users input trace width, thickness, desired temperature rise, and ambient temperature to receive a calculated current limit in amperes. The tool provides a quick way to verify trace safety without revising designs, and the site also links to related calculators for trace width, resistance, and impedance. The interface presents inputs in a clear form layout, and the results page includes a current vs. width vs. temperature graph to visualize how trace dimensions affect capacity. Explanations on the page clarify the relationship between width, temperature, and current, making the physics accessible to hobbyists and designers alike.

Step by step

How to use the Omni Calculator PCB Trace Current Calculator

  1. 1

    Enter the trace width in mils or millimeters

  2. 2

    Input the trace thickness, typically 1 oz or 2 oz per square foot

  3. 3

    Specify the maximum desired temperature rise above ambient

  4. 4

    Provide the ambient temperature of the operating environment

  5. 5

    View the calculated maximum current capacity and accompanying graph

Is it right for you

Best for

Hobbyists, makers, and PCB designers who need a fast, free way to verify if a trace width can handle their circuit's current without overheating.

Limitations

  • Results are based on empirical formulas and may vary with board layout and cooling conditions
  • Does not account for external factors like forced airflow or conformal coating
  • Input units are fixed; switching between metric and imperial requires re-entry of values
Questions

PCB Trace Current Calculator FAQ

Can this calculator determine the minimum trace width needed for a specific current?
The tool uses standard IPC-2152 formulas, which are reliable for typical hobbyist and consumer electronics but may not cover extreme high-current or specialized industrial applications.
What units should I use for trace width and thickness?
The calculator provides a current limit; actual safe operating current may be lower depending on board density, heat sinking, and surrounding components.
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