PI Attenuator Calculator
Enter values for R1 and R2 to calculate attenuator loss and impedance.Alternatively, Generate R1 and R2 for a wanted attenuation.
R1 Ω Zo Ω 
R2 Ω 
Attenuation Return Loss 

Attenuation dB 
Notes:
*Strictly, a loss quantity when expressed in dB should be positive. However, convention and some literature quote return loss as a negative value akin to an S(1,1) measurement on a Network analyser.
*Attenuation result is in the specified system Zo