which impedance calculator to use

[hsn93]

hi,

there are a lot of signals that need to be matched within 10%.

say 50ohm impedance matching leaving you (45 - 55ohm) range.

i got 3 calculators here :


layer stackup and thicknesses:



the first calculator saturn pcb:


the second calculator excel made from various websites:


the 3rd calculator altium
i set the solder mask thickness to 0 in case it affect the calculation as i didnt see others considering it


and the impedance:


i checked altium impedance equation:



saturn pcb differ from excel calculator with around ~10% which is the limit
and that is being said while im ignoring the pcb manufacturer PCB thickness +/- 10% ..

altium is too far from that so which one so which one would you use ?


=================
i've seen this post before
https://www.eevblog.com/forum/altium/difference-between-altium-and-saturn-pcb-toolkit-impedance-calculation/
in that post various experts states that you should tell pcb manufacturer what you want ..
what if i dont want to i want to  tell them but to take their stackup and do the design based on that ?

in this case you cant control impedance within 10% ?