Calculate trace width for all layers?

[swen_s]

I need to route 50 ohm signals on an 8 layer board. To keep the impedance at 50 ohm I need to calculate the trace width on all the layers.

I have found Polar instruments si8000. But is there some free software that I can use?

What program do you use to do this?

 

[sivamani]

search in Google u will get online calculators...
For accurate results u need contact fabricator.

 

[senilicus]

Got to https://saturnpcb.com/pcb_toolkit.htm and download the "Pcb Desing Tool Kit. It can do what you want, and a lot more !!!!!!!!!

 

[sapphire_2010]

Try Saturn PCB as mentioned above or try this link:
https://www.hughescircuits.com/index.php/en/support/impedance-calculator

To utilize these calculators, you may need to know the Board material, dielectric thickness & copper weight first. If you don't have this info then check with your Fab house for available board material & thickness.

 

[marce]

https://www.technick.net/public/code/cp_dpage.php?aiocp_dp=util_pcb_imp_calculator

**broken link removed**

You don't say whether your trace is going to be:
microstrip, embedded microstrip, or stripline.

 

[dehati]

For Stripline use this calculator

http://referencedesigner.com/tutorials/si/si_07.php

For microstrip use this one

http://referencedesigner.com/tutorials/si/si_06.php