How does the P C B Trace Width Calculator work?

Current flowing through trace Then: Trace length and thickness (oz/ft² of copper) Then: Ampacity nomogram: 1 oz, 1 A/mil² roughly Then: Formula: width (mils) = current (A) ÷ (ampacity × thickness).

Can you give an example of how to use the P C B Trace Width Calculator?

Example: Input Current 2A, copper 1oz gives a result of Width 20 mil.

Is the P C B Trace Width Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the P C B Trace Width Calculator?

Our P C B Trace Width Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Maalum

P C B Trace Width Calculator

PCB Trace Width Calculator

Current (A)

Temperature Rise (°C)

Calculates minimum PCB trace width for current capacity considering voltage drop and temperature rise. Prevents overheating and signal degradation.

Symbol	Name	Unit	Description
A	A value	—	Variable used in the calculation

Difficulty:intermediate

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Did You Know?

Trace fires from current overload are preventable with proper design; affects insurance and liability.

References

›PCB Trace Width Calculator

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P C B Trace Width Calculator

PCB Trace Width Calculator

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PCB Trace Width Calculator