// multi-utility computation suite · offline · instant · precise
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eng.antenna-gain-dBi Calculator
Calculates antenna gain in dBi from antenna aperture and frequency, and converts between dBd and dBi. A half-wave dipole has 2.15 dBi of gain — all antenna gain specifications above this require concentrating the radiation pattern in a preferred direction.
Inputs
Efficiency Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Directivity Dbi
Reference formula or conversion factor shown for context.
Results
gain G (dBi)
The improvement or increase over the baseline.
gain linear
The improvement or increase over the baseline.
radiation efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
G = η·D
Reference formula or conversion factor shown for context.
typical values
The computed numeric or monetary value.
G_dBi = D_dBi + 10log10(η)
Reference formula or conversion factor shown for context.