How to calculate trace resistance on a PCB?

[Faringdon]

Hi,
How do I measure the total track resistance in the mains AC input section of my 2kW offline SMPS, from  Mains AC connector up to diode bridge?
It’s a 4 layer board as attached, in  Eagle Pro 7.4.0 (1 oz copper)
Diode bridge is the two GBJ5010’s (two 4-in-line packages on the heatsinks)

[ebastler]

The command "run length-freq-ri" will print a list of trace lengths, resistances, and frequency limits for each signal in your layout.

I believe this works for traces of varying width as well (but it's been a while since I used it.) The copper thickness is set in the Design Rules/Layers dialog, if I remember correctly.