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Friis Path Loss Calculator

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This calculator computes the power that a receiving antenna receives for a given transmitting antenna for a given power for a distance greater than one wavelength for line of sight transmission.  The greater the frequency the greater the path loss. 

Ptx (dB)
lambda (wavelength), OR
f (frequency)
(m)  OR
d (Distance)  (m)
Gtx (dB)
Grx (dB)

Prx (dB)


Prx= Ptx*Gtx*Grx*( (lambda)/(4*PI*d) )^2

OR in dB

Prx= Ptx(dB)+ Gtx(dB)+ Grx(dB)  -  20log(4*PI*d/lambda);

The last term is the path loss. 

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