Friis Path Loss Calculator

Enter value (enter value of frequency or wavelength) and click on calculate. Result will be displayed.
InputPtx:
dB
Wavelength:
m

Or

Frequency:
MHz
Distance:
m
Gtx:
dB
Grx:
dB
Prx:
dB

The Friis Path Loss Calculator is a tool used to determine the amount of signal loss (also called "path loss") over a wireless communication link. It's based on the Friis Transmission Equation, which calculates how much power is received at a certain distance from a transmitting antenna, taking into account the frequency of the signal and the distance between antennas.

The formula for Friis Path Loss (in free space) is:


Where:

PL(dB) = Path loss in decibels (dB)
d = Distance between the transmitting and receiving antennas (meters)
f = Frequency of the signal (Hertz)
c = Speed of light (~3×108m/s)
A Friis Path Loss Calculator simplifies this by letting you input values like frequency, distance, and sometimes antenna gains — and it gives you the resulting path loss directly.

It's often used in RF engineering, wireless communication system design, and for calculating signal coverage in systems like Wi-Fi, cellular networks, and satellite links.