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PCB Trace Width
Estimate copper width for a current.
Live results
- Estimated minimum width
- 0.30211 mm
- Width in mils
- 11.894 mil
Adjust the circuit
Trace current
Allowed temperature rise
Copper carrying the load
0.30211 mm
1 ACurrent+10 °CAllowed rise
Relative width display · 11.894 mil · 34.8 µm thick
All calculated values
Live results
- Estimated minimum width
- 0.30211 mm
- Width in mils
- 11.894 mil
- Copper thickness
- 34.8 µm
Formula and assumptions
A = [I / (k × ΔT^0.44)]^(1/0.725) · width = A / copper thicknessLegacy IPC-2221 curve fit: area in mil²; k=0.048 external, 0.024 internal. 1 oz/ft² ≈34.8 µm copper; 1 mil=0.0254 mm. ΔT is rise above ambient, not absolute temperature. Approximate sizing only—not IPC-2152 simulation. Planes, substrate, airflow, vias and fabrication limits are not modeled. Validate thermally and with your manufacturer.
Technical reference ↗