I want to calculate the approximate trace width for a 50 ohm trace. Can you please suggest if my calculations below are correct? I am using an online calculator.
fr4 dielectric constant : 4.58 -> digged this out from seedstudio fr4 spec documents
Dielectric thickness: 0.2mm -> Seedstudio 4 layer DRU file, isolation between layer 1-2 is 0.2mm. (My second layer is a GND plane)
Trace thicnkess : 0.035mm -> Seedstudio 4 layer DRU file, copper thickness is 0.035mm
with this data, I get a track width of 13mils
can you please suggest if my calculations are okey?