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Calcimator

Free Space Path Loss Calculator

Calculate free space path loss (FSPL) from distance and frequency. Includes received signal power estimation.

Inputs

MHz
km
dBm
dBi
dBi

Results

Free Space Path Loss

91.52 dB

Received Power

-61.52 dBm

Received Power0 W
Wavelength0.3331 m
How to Use This Calculator
  1. Enter the link frequency (MHz or GHz) and path distance.
  2. Enter transmit power and antenna gains for both ends of the link.
  3. Review free-space path loss (dB) and estimated received power in dBm and watts.
  4. Use received power vs. your receiver sensitivity to determine link margin.
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Formula

FSPL (dB) = 20·log₁₀(d) + 20·log₁₀(f) + 32.44

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