Antenna Gain Calculator

Calculate antenna gain in dBi from aperture dimensions, frequency, and efficiency. Includes beamwidth and effective aperture area.

Frequency

MHz

Aperture Width

Aperture Height

Antenna Efficiency

Tab to move between fields

Gain

11.92 dBi

Horizontal Beamwidth

46.63°

Gain (Linear)15.6×

Wavelength0.3331 m

Vertical Beamwidth46.63°

Effective Aperture0.1375 m²

Physical Aperture0.25 m²

How to Use This Calculator

Enter the center frequency (MHz or GHz).
Set aperture width and aperture height in meters (for parabolic dish or horn antennas).
Enter antenna efficiency (0.55-0.70 is typical for a well-designed reflector).
Review calculated gain in dBi and linear scale, effective wavelength, and half-power beamwidths.
Use gain value in link budget calculations to determine received signal strength.

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Formula

G = (4π × η × A) / λ²

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Calculate Effective Isotropic Radiated Power from transmit power, cable loss, connector loss, and antenna gain.

Calculate half-wave dipole element length from target frequency. Includes quarter-wave, full-wave, and 5/8-wave lengths.

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