PCB Unit Conversion Calculator
This PCB unit conversion tool helps engineers quickly convert common units used in PCB fabrication, PCB layout design, copper thickness selection, board thickness specification, weight estimation, and PCB panel area calculation.
Length / Thickness Conversion
Weight Conversion
Area Conversion
Why PCB Unit Conversion Matters
Accurate unit conversion is important in PCB fabrication because PCB drawings, Gerber files, fabrication notes, and engineering specifications may use different measurement systems. PCB designers often use mil for trace width and spacing, while manufacturers may also use millimeter, micrometer, square inch, square meter, and ounce copper weight during production review.
Common PCB engineering units include mil, inch, millimeter, micrometer, ounce copper, square inch, and square meter. Correct conversion helps reduce misunderstanding in PCB thickness, copper thickness, trace width, spacing, drill size, and panel area calculation.
Common PCB Thickness Conversion Reference
| PCB Thickness | Approx. Thickness in Mil | Typical Use |
|---|---|---|
| 0.4 mm | 15.7 mil | Thin PCB, compact electronics |
| 0.6 mm | 23.6 mil | Thin PCB, small devices |
| 0.8 mm | 31.5 mil | Thin to medium PCB thickness |
| 1.0 mm | 39.4 mil | Medium PCB thickness |
| 1.2 mm | 47.2 mil | Medium PCB thickness |
| 1.6 mm | 63.0 mil | Standard FR4 PCB thickness |
| 2.0 mm | 78.7 mil | Thicker PCB, mechanical strength |
| 2.4 mm | 94.5 mil | Heavy-duty PCB application |
| 3.2 mm | 126.0 mil | Very thick PCB, special application |
PCB Copper Thickness Reference
| Copper Weight | Approx. Thickness | Approx. Thickness in Mil |
|---|---|---|
| 0.5 oz copper | 17 μm | 0.67 mil |
| 1 oz copper | 35 μm | 1.37 mil |
| 2 oz copper | 70 μm | 2.74 mil |
| 3 oz copper | 105 μm | 4.13 mil |
| 4 oz copper | 140 μm | 5.51 mil |
| 6 oz copper | 210 μm | 8.27 mil |
PCB Unit Conversion FAQ
What is 1 mil in mm?
1 mil equals 0.001 inch, or 0.0254 mm. In PCB design, mil is commonly used for trace width, spacing, solder mask clearance, and mechanical tolerance.
What is the standard PCB thickness?
The most common standard FR4 PCB thickness is 1.6 mm, which is approximately 63 mil.
How thick is 1 oz copper?
1 oz copper is approximately 35 micrometers, or about 1.37 mil.
What unit is commonly used for PCB trace width?
PCB trace width is commonly specified in mil or millimeter. Many PCB layout tools allow designers to switch between imperial and metric units.
Why do PCB manufacturers use both metric and imperial units?
PCB customers may submit drawings, Gerber files, and fabrication notes from different CAD systems. Some use inch and mil, while others use millimeter and micrometer. Unit conversion helps engineers and manufacturers confirm the same design requirements.