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PCB Trace Width Calculator

= 35.0 µm
°C
°C
Trace Width
11.83 mils
300.4 µm
Area
16.30 mil²
0.010514 mm²
Resistance
43.29 mΩ/in
1.704 mΩ/mm
Voltage Drop
43.29 mV/in
1.704 mV/mm
Power Loss
43.29 mW/in
1.704 mW/mm

Note: Actual current capacity depends on PCB layout, nearby copper (heatsinking), thermal conductivity of substrate/solder mask, and airflow. Use these values as a starting point and verify with thermal analysis.

Reverse: Current Capacity
Width:mils(254.0 µm)
→0.89 Amax current
Show formulas

First, calculate the Area:

A=(Ik×TRise b)1cA = \left( \frac{I}{k \times T_{Rise}^{\ b}} \right)^{\frac{1}{c}}

Then, calculate the Width:

W=At×1.378W = \frac{A}{t \times 1.378}

IPC-2221 external layers:

k = 0.048, b = 0.44, c = 0.725

Variables:

I = Current (A), TRise = Temp rise (°C)

A = Area (mil²), t = Thickness (oz), W = Width (mils)

Reference:

1 oz copper ≈ 1.378 mils ≈ 35 µm

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