PCB Unit Converter
mil, mm, micrometre, inch, ounces of copper and AWG — converted both ways, with copper weight treated as plating thickness rather than mass.
mil · mm· µm
ozcopper weight
The two conversions that matter
| 1 mil | 0.0254 mm = 25.4 µm |
| 1 oz copper | 1.378 mil = 34.8 µm thick (copper density 8.96 g/cm³) |
| 1 oz copper | Not 35 µm — 34.8 µm. The 0.6% matters at 13 oz. |
| 2/2 mil trace and space | 0.05 mm / 0.05 mm |
| 1 mil | 25.4 µm, so ±8 µm trace accuracy is about ±0.3 mil |
Our process window: minimum trace and space 2/2 mil (0.05 mm), trace width accuracy ±8 µm, copper 1–13 oz finished (outer base copper up to 18 oz).