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Free Space Loss Calculation


The formula for calculating free space loss is:

20 * Log10 (frequency in MHz) + 20 * Log10 (Distance in Miles) + 36.6

Free Space Loss is the loss that a radio signal experiences when traveling through free space. This calculation is important when determining the amount of power you will need to complete your 2.4GHz WiFi Point to Point Link. It is also very important for other frequencies as well.

Distance: 2 miles 4 miles 6 miles 10 miles 20 miles
2.4GHz FSL: 110 dB 116 dB 119 dB 124 dB 130 dB
5.8 GHz FSL: 118 dB 124 dB 127 dB 132 dB 138 dB

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