A question that comes up often is

**Can you convert dB to dBi?**

The answer is no.

Let’s understand why

**dB** is short for deciBels. It represents the logarithm of the equivalent linear quantity. Power in dB is calculated using the formula:

**P _{dB} = 10*Log_{10}(P_{linear})**

Use this calculator to compute the dB value from its linear equivalent.

An antenna’s **dBi** value is a measure of its gain compared to an **isotropic** antenna. Isotropic antennas radiate signal equally in all directions. An antenna with a higher dBi value has more gain than an antenna with a lower dBi value.

Antenna gain can be calculated using this tool. It is calculated using the formula:

**Gain (dBi) = 20*Log _{10}(9.73/(λ***

**(10)**

^{AF/20}))Where

**λ**= Wavelength =**c/f**, where**c**is the speed of light and**f**is the frequency**AF**= Antenna Factor