Use our advanced PCB Trace Width Calculator to precisely determine the required trace dimensions for your circuit board designs. This tool helps engineers and hobbyists prevent overheating and ensure reliable power delivery by adhering to IPC-2221 standards based on current, temperature rise, and copper thickness.
Formula:
The calculator utilizes an adapted version of the IPC-2221 standard (formerly IPC-D-275) formulas to determine the required trace area and subsequently the width for your PCB design.
Formula:
Area (mils2) = (I / (k × ΔTb))1/c
Width (mil) = Area (mils2) / (Toz × 1.378)
Where:
- I = Max. Current (Amps)
- ΔT = Allowable Temperature Rise (°C)
- Toz = Copper Weight (oz)
- k, b, c = IPC-2221 Constants (depend on trace location)
- External Traces: k = 0.048, b = 0.44, c = 0.725
- Internal Traces: k = 0.024, b = 0.44, c = 0.725
- 1.378 = Conversion factor from oz to mil (1 oz ≈ 1.378 mil)