Calculate VSWR and Return Loss from Zload (or Yload or S11) and Zo

This calculator allows calculation of VSWR from Zload (or Yload or S11) and Zo. Note:

impedance is a complex quantity, it has real and imaginary parts or magnitude and phase;
instruments are almost always calibrated for Zo being some nominal real value, is Xo=0 (eg when people speak of a 50Ω instrument, that means 50+j0Ω even if they don't know that); and
cables with loss almost always have Xo≠0, but for most low loss cables at HF and above, Xo<<Ro.

The results are valid only for linear circuits.

The calculator does not do a lot of error checking, if you enter nonsense, it will probably produce nonsense.

Changes