Free Space Loss Application Calculators
 
Loss of power over distance (assuming no FRESNEL Effect and nothing in the way). This a very idealised calculation and in practice everything interferes with the signal but it will give you a reasonable approximation of the actual loss over distance.

Enter the system Frequency in MHz and the distance in either Kilometers (Km) or Miles below and then click the 'Calculate' button. 1 GHz = 1000 MHz e.g. 2400 = 2.4 GHz.

Frequency Distance   Result
 MHz  Km
OR
 Miles		  dB

 

Calculations and Equations used:

  1. Free space loss = 36.56 + 20Log10 (Frequency) + 20Log10 (Distance in miles)

  2. Calculator normalises all distances to miles

  3. Miles to Kilometers = 1.609

  4. Kilometers to miles = 0.621