[SI-LIST] Conversion from dB to ohm

Hi! The formula for conversion from ohm to dB is :
Ztrans=25*10^(|S21|/20).
So if S21=-60dB then Ztrans=25000, what is this value
in i.e. units is in ohm but do I need to divide it
with some factor to get in ohms.
I am trying to convert and it is not corelating.
Any inputs appreciated.
Thanks
Bob

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