PCB Trace Width Calculator

By formulas from IPC-2221, PCB Trace Width Calculator can estimate the width of copper PCB boards and the trace required under the given current, and at the same time keep the rise in trace temperature not to exceed the limit. Note: The trace on the inner layer need to be much wider than the trace on the outer surface of the board. The results are estimates, actual results may vary depending on application conditions.

Current (I)

A

Ambient Temperature

°C

Thickness (t)

oz/ft²

oz/ft²

mil

mm

µm

Trace Length

in

Temperature Rise (TRise)

°C

°C

°F

Internal Layers: Minimum Trace Width

External Layers in Air: Minimum Trace Width

*Internal Layers:

Required Trace Width (W)

mil

mil

mm

µm

*External Layers in Air:

Required Trace Width (W)

mil

mil

mm

µm

Resistance

Ω

Resistance

Ω

Voltage Drop

V

Voltage Drop

V

Power Loss

W

Power Loss

W

FORMULA

First, calculate the Area:

calculate the Area

Then, calculate the Width:

calculate the Width

For IPC-2221 internal layers:

k = 0.024, b = 0.44, c = 0.725

For IPC-2221 external layers:

k = 0.048, b = 0.44, c = 0.725

where k, b, and c are constants resulting from curve fitting to the IPC-2221 curves.

Common values:

Thickness: 1 oz

Ambient: 25 °C

Temp rise: 10 °C

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