dBi to dBd
Type a value in dBi to get it in dBd instantly.
0.85dBd
That's 1.22× as directional as a half-wave dipole, while a Wi-Fi router antenna is 1.58× more directional. That is 1.995× the power of an isotropic antenna in its best direction.
Convert the other way: dBd to dBi
What it means
How much gain is that?
Peak gain in the main direction. Gain does not add power: it concentrates it, at the cost of other directions.
The math
How to convert dBi to dBd
dBi = dBd + 2.15; power ratio = 10^(dBi ÷ 10).
Example: 3 dBi = 0.85 dBd.
Every unit
That gain in every unit
Tables
dBi to dBd conversion table
| dBi | dBd |
|---|---|
| 0 dBi | -2.15 dBd |
| 2.15 dBi | 0 dBd |
| 3 dBi | 0.85 dBd |
| 5 dBi | 2.85 dBd |
| 6 dBi | 3.85 dBd |
| 8 dBi | 5.85 dBd |
| 9 dBi | 6.85 dBd |
| 10 dBi | 7.85 dBd |
| 12 dBi | 9.85 dBd |
| 15 dBi | 12.85 dBd |
| 20 dBi | 17.85 dBd |
| 24 dBi | 21.85 dBd |
| 30 dBi | 27.85 dBd |
dBd to dBi conversion table
| dBd | dBi |
|---|---|
| 0 dBd | 2.15 dBi |
| 2.15 dBd | 4.3 dBi |
| 3 dBd | 5.15 dBi |
| 5 dBd | 7.15 dBi |
| 6 dBd | 8.15 dBi |
| 8 dBd | 10.15 dBi |
| 9 dBd | 11.15 dBi |
| 10 dBd | 12.15 dBi |
| 12 dBd | 14.15 dBi |
| 15 dBd | 17.15 dBi |
| 20 dBd | 22.15 dBi |
| 24 dBd | 26.15 dBi |
| 30 dBd | 32.15 dBi |
Quick answers
Quick answers
- How many dBd is 1 dBi?
- 1 dBi is -1.15 dBd.
- How many dBd is 10 dBi?
- 10 dBi is 7.85 dBd.
- How many dBd is 3 dBi?
- 3 dBi is 0.85 dBd.
The units
About these units
dBi (dBi)
Gain over an isotropic radiator.
dBd (dBd)
Gain over a half-wave dipole.
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