Instantly convert between common PCB measurement units. Essential for working with international datasheets and specifications.
Convert between mil, mm, inch, and micron
Convert between oz/ft² and thickness
Convert between square units
Convert between Celsius and Fahrenheit
| oz/ft² | Micron | Mil |
|---|---|---|
| 1/3 oz | 9 μm | 0.35 mil |
| 1/2 oz | 17 μm | 0.7 mil |
| 1 oz | 35 μm | 1.4 mil |
| 2 oz | 70 μm | 2.8 mil |
| 3 oz | 105 μm | 4.2 mil |
Our engineers can help interpret datasheets and specifications for your PCB design.
Unit conversion is the process of expressing the same physical quantity in different measurement systems without changing its underlying value. In PCB work that commonly includes length, copper weight, area, and temperature, each of which appears in design files, fabrication notes, and supplier communication.
This page was reviewed for GEO clarity by Hommer Zhao of WIRINGO so the content explains the underlying engineering terms, not only the interface or headline claim.
Most conversion mistakes do not come from a lack of math. They come from switching contexts too quickly. A layout engineer may think in mil, a mechanical drawing may be in millimeters, and a supplier may describe copper weight in ounces. If the project does not normalize those terms early, avoidable confusion reaches the quote, the drawing, and sometimes the released part.
Simple reference tools help because they take one repeated source of friction out of the workflow. That matters most when multiple suppliers or regions are involved and every conversation depends on the same thickness, spacing, or area number being understood the same way.
Conversion discipline matters in tolerance-sensitive communication. Minimum trace width, finished copper thickness, board outline, and thermal limits are all values that should be stated unambiguously. A drawing that mixes conventions without a clear primary unit increases review time and creates more chances for manual interpretation.
The practical rule is to choose one release convention, then cross-check any imported values. That is particularly important when legacy data or customer notes are copied into a new project package.
| Value Type | Common Mixed Units | Why A Check Helps |
|---|---|---|
| Trace geometry | mil and mm | Prevents width and spacing mistakes |
| Copper thickness | oz and micron | Supports consistent fabrication notes |
| Area | sq mm and sq in | Improves panel and quoting discussions |
| Temperature | C and F | Avoids process or storage confusion |
| Mechanical dimensions | inch and mm | Keeps enclosure and connector fit aligned |
The external references below are included as basic background reading for common manufacturing and interconnect terms used on this page.
https://en.wikipedia.org/wiki/IPC_(electronics)
https://en.wikipedia.org/wiki/ISO_9001
https://en.wikipedia.org/wiki/Crimp_(joining)