Antenna Gain Calculator

This tool computes the Antenna Gain using:

  • Antenna Factor (units: dB/m)
  • Frequency of operation (units: Hz/kHz/MHz/GHz)

Antenna Gain Formula

Gain (dBi) = 20*Log10(9.73/(λ*(10)AF/20))


  • λ = Wavelength = c/f, where c is the speed of light and f is the frequency
  • AF = Antenna Factor


Antenna Factor

It is the ratio of the electric field E (units: V/m or μV/m) to the voltage V (units: V or μV) induced across the terminals of an antenna.

The units are dB-per-meter or dB/m.

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[1] Antenna Factor on Wikipedia