PCB Trace Width Calculator
By using formulas from the IPC-2221 standard, the 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 exceeding the limit. Note: The trace on the inner layer needs 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.
A
formula
First, calculate the Area:
Then, 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
Minimum Trace Width
Minimum Trace Width
Internal Layers
External Layers in Air
Required Trace Width (W)
Required Trace Width (W)
Resistance
Resistance
Ω
Ω
Voltage Drop
Voltage Drop
V
V
Power Loss
Power Loss
W
W