signal integrity

Trace Width Calculator

Based on the IPC-2221 standard. Accounts for copper weight (oz/ft²), allowed temperature rise above ambient, and whether the trace is on an external or internal layer. External traces dissipate heat more effectively, so they can be narrower for the same current.

Inputs

Current(A)

RMS current through the trace

Temperature Rise(°C)

Allowed temperature rise above ambient

Copper Weight(oz/ft²)

Standard copper weights: 0.5, 1, 2, 3 oz/ft²

Internal Layer

1 = internal layer, 0 = external layer

Results

Trace Width0.3021mm

Trace Width11.89mil

Resistance (per cm)16.40mΩ/cmResistance per centimetre of trace length