PCB Trace Resistance Calculator

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Copper is standard for PCB traces. Resistivity and temperature coefficient change with material.
End-to-end length of the trace from pad to pad.
mm
Width of the copper trace on the PCB.
mm
1 oz/ft2 is the most common PCB copper weight. Higher oz gives lower resistance but less fine-detail routing.
Operating temperature of the trace. Resistance increases with temperature (copper: +0.393%/degC above 25 degC reference).
degC
Current flowing through the trace. Used to calculate voltage drop and power dissipation.
A
Trace resistanceModerate resistance
98.514mOhm

DC resistance of the trace at the specified temperature

Cross-sectional area0.0175mm2
Temperature correction factor1
Voltage drop (V = I x R)98.514mV
Power dissipation (P = I2 x R)98.5143mW
Sheet resistance (rho/T)0.4926mOhm/sq
98.514 mOhm
Very low<1Low1-10Moderate10-100High100+

Copper trace resistance: 98.514 mOhm

  • Trace resistance is 98.514 mOhm, which causes a 98.514 mV drop at 1 A.
  • Power loss of 98.51 mW is within an acceptable range for most designs.
  • Cross-sectional area is 0.0175 mm2. Larger cross-sections reduce both resistance and temperature rise.

Next stepResistance is high. Widen the trace, increase copper weight (oz/ft2), or shorten the route to bring resistance into a practical range.

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