Friis Free-Space Path Loss Calculator
Calculate received power, path loss, and wavelength using the Friis transmission equation.
Friis Equation Calculator
Enter frequency, distance, and optionally TX power and antenna gains to calculate free-space path loss and received power.
Formulas:
FSPL(dB) = 20 × log₁₀(4πd / λ)
P_r = P_t + G_t + G_r − FSPL
λ = c / f
FSPL(dB) = 20 × log₁₀(4πd / λ)
P_r = P_t + G_t + G_r − FSPL
λ = c / f