PCB Trace Width Calculator
Calculate the required trace width for your PCB design based on current, copper weight, and acceptable temperature rise using IPC-2221 standards.
Calculate Trace Width
IPC-2221 Formula
A = (I / (k × ΔT^b))^(1/c)
- A: Cross-sectional area (mils²)
- I: Current (Amperes)
- ΔT: Temperature rise (°C)
- k, b, c: Constants based on layer type
Common Trace Widths
| Current (A) | 1 oz Copper (mils) | 2 oz Copper (mils) | 20°C Rise |
|---|---|---|---|
| 0.5A | 3.0 | 1.5 | External |
| 1A | 7.8 | 3.9 | External |
| 2A | 20.3 | 10.2 | External |
| 3A | 35.5 | 17.8 | External |
| 5A | 71.9 | 36.0 | External |
| 10A | 187.1 | 93.5 | External |