Gain to dB Calculator

The two calculators below convert input/output power and voltage to a Power Gain in dB (deciBel).

Linear Power to dB Gain

Formula

GdB = 10*log10(Pout/Pin)

Linear Voltage to dB Gain

Formula

GdB = 20*log10(Vout/Vin)

This assumes the input and output impedance is the same.

dB to Gain Calculator