Reference Designer Calculators



Free Space Loss Calculator


Free Space Loss is the power loss of a radio signal as it travels through free space. Free Space loss calculation helps RF designers estimate the receive power strength for a given transmitter power. It helps determine the line of sight distance.

Free space loss depends upon frequency and distance. The loss increases with increas in frequency and obviously with increase in distance. Following is the formula for Free Space los

Free Space Loss (dB) = 36.6 + 20 x Log (Frequency (MHz) x Distance (Miles))



Freq in MHz
Distance in miles