dB Gain Calculator

Your details

Power entering the component or system (any consistent unit - both values must use the same unit).
W
Power leaving the component or system (same unit as input power).
W
dB gain / lossStrong gain
20dB

Positive = gain, negative = loss/attenuation.

Linear ratio100
Signal changePower increases by a factor of 100.0000 (20.00 dB gain)
Loss ratio0.01
20 dB
Heavy loss<-20Attenuation-20--3Unity-3-3Moderate gain3-20Strong gain20+

20.00 dB of gain - output is 100.00x the input.

  • A gain of 20.00 dB means the output is 100.00x stronger than the input (power ratio).
  • 20 dB corresponds to a voltage ratio of 10 or a power ratio of 100 - a strong amplification stage.

Next stepFor RF or acoustic power, the 10 log formula is standard. If you are stacking multiple components, add their individual dB gains to find the total system gain.

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