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Original heme by orderedlist (CC-BY-SA)

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PCB Notes

Copper thickness is commonly expressed in oz, for example 1 oz Cu. This is shorthand for the height of copper if spread over a square foot surface.

To calculate the height for 1 oz Cu, we need a few conversions:

This implies:

Or, in general,

$$ z\ \mathrm{oz}\ \mathrm{Cu} \rightarrow z \cdot 1.34\ \mathrm{mil} $$

Where $1\ \mathrm{mil} = \frac{1}{1000}\ \mathrm{in}$.