Free Space Path Loss Calculator

Calculate free space path loss for radio wave propagation. Determine signal attenuation over distance.

Input Parameters

Frequency (MHz)

Distance (km)

Results

Enter values and click Calculate

About Free Space Path Loss Calculator

Free space path loss (FSPL) is the signal attenuation in a vacuum: FSPL = 20log₁₀(d) + 20log₁₀(f) + 32.44 dB, where d is distance in km and f is frequency in MHz.