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eng.free-space-path-loss Calculator
Calculates free-space path loss from frequency and distance using the Friis transmission formula. FSPL increases 6 dB every time distance doubles and 20 dB per decade of frequency — higher frequency signals suffer greater distance attenuation.
Inputs
Frequency Mhz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Distance Km
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Tx Power Dbm
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Rx Sensitivity Dbm
Reference formula or conversion factor shown for context.
Results
FSPL (dB)
Reference formula or conversion factor shown for context.
link budget (dB)
Sample size or count used in the calculation.
link margin (dB)
Sample size or count used in the calculation.
link viable?
Sample size or count used in the calculation.
FSPL = 20log(f) + 20log(d) + 32.44 dB
Reference formula or conversion factor shown for context.