Antenna Gain Converter
Enter a gain value and choose dBi or dBd to see the equivalent unit instantly in your browser.
Enter a finite value from −1e6 to 1e6 dB.
Converted:
A QUICK WALKTHROUGH
How to use this tool
- Enter a finite gain value from −1e6 to 1e6 dB.
- Choose whether the input is dBi or dBd.
- Read the converted gain, rounded to up to 10 significant digits.
Fixed relationship
This converter uses dBi = dBd + 2.15 dB, or dBd = dBi − 2.15 dB.
Precision and scope
Finite values from −1e6 to 1e6 dB are accepted. Results use browser number arithmetic and display up to 10 significant digits; this is a unit conversion, not an antenna performance estimate.
Local calculation
The value is calculated entirely in your browser and is not uploaded.
GOOD TO KNOW
Common questions
What is the formula?
dBd = dBi − 2.15 and dBi = dBd + 2.15.
How accurate is it?
It applies the fixed 2.15 dB relationship and rounds the display to up to 10 significant digits.
Is my data uploaded?
No. Conversion runs locally in your browser.