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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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