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

G_dB = 10*log₁₀(P_out/P_in)

Linear Voltage to dB Gain

Formula

G_dB = 20*log₁₀(V_out/V_in)

This assumes the input and output impedance is the same.

dB to Gain Calculator