Unit Conversion in PCB

Are you facing unit conversion sometimes? Now let's review the commonly used unit conversion in PCB industry.

1. Metric System and English System

Metric System include the following unit:

dm

cm

mm

um


English System include the following unit:

ft

ln

mil

uin


PCB manufacturers often use cm/mm and inch/mil to measure line space/line width

2. Conversion

1dm=10cm

1ft=12in

1cm=10mm

1in=1000mil

1mm=1000um

1mil=1000uin


3. Metric and British mutual convesion

1in=2.54cm=25.4mm=25400um

1mil=25.5um

1mil=0.0254mm

1uin=0.0254um

1mm=39.37mil

1um=39.37uin


4. Copper foil thickness conversion

1oz=35um=1.35mil

2oz=70um=2.7mil

1/2oz=17.5um=0.7mil

1/3oz=11.7um=0.5mil

1/4oz=8.8um=0.35mil



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