# Home > Terms > English (EN) > decibel (dB)

### decibel (dB)

A practical unit of relative gain. In terms of power, the relative gain in decibels is equal to:

Gain (dB) = 10 log10(Pout/Pin ),

where Pout is the output power and Pin is the input power. For voltage, if the input and output impedances are the same, the gain in decibels is

Gain (dB) = 20 log10(Vout/Vin ),

where Vout is the output voltage and Vin is the input voltage. For current, if the input and outpu impedances are the same, the gain in decibels is given by:

Gain (dB) = 20 log10(Iout/Iin),

where Iout is the output current and Iin is the input current. Losses are indicated by negative dB gain values.

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