dBi to dBd Calculator

This handy tool converts antenna gain from deciBel relative to an isotropic antenna (dBi) to deciBel relative to a dipole antenna (dBd).


	

			

		

						

				

				

                

			

			
						

		

		






🔄 dBd to dBi 





Formula





Gain (dBd) = Gain (dBi) – 2.15





Example Applications





Example 1: Home Wi-Fi Router Antenna





    

  • Scenario: You’re comparing two Wi-Fi routers for your home network. Router A has an antenna gain of 5 dBi, while Router B’s antenna gain is specified as 2 dBd.
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  • Conversion for Comparison: To compare them directly, use the calculator to convert Router A’s gain to dBd: 2.85 dBd compared with Router B at 2 dBd
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  • Conclusion: Router A will provide slightly better range or coverage, all other factors being equal.
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Example 2: Outdoor Directional Antenna for a Base Station





    

  • Scenario: For a community internet service, you’re setting up an outdoor base station requiring a directional antenna. You have the option between an antenna with 14 dBi gain and another with 11 dBd gain.
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  • Conversion for Comparison: Convert the 14 dBi gain into dBd to make an accurate comparison
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  • Conclusion: The antenna with 11.85 dBd gain offers slightly better performance in terms of potential coverage and signal strength compared to the 11 dBd of the second antenna.
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These examples demonstrate the use of the calculator. Whether you’re setting up a home network or a community internet service the calculator helps you make informed decisions regarding antenna selection for optimal performance.





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