Determining Impedance of Trace

I’m new to PCB deisgn and I’m wondering if the best way to determine the trace impedance is to look at manufacturer specs as well as the set width I have on KiCad?
Is there any way on Pcbnew to have it tell you the impedance of a trace?

Not directly. KiCad does have a tool built in.
From the main screen select the PCBCalculator icon and then the TransLine tab
This offers a calculator for a variety of types.

You have to know your layer thicknesses and dielectric constant. Then adjust track width to get the impedance that you want

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You can get track length with: Pcbnew / Route / Tune Track Length

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