Decibel Calculator

dB from power or voltage ratio.

Input Parameters

Mode

Value A

Value B

Calculation Summary

Decibels (dB)20.00

Ratio100

××100

175 available

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About this calculator

Decibels from power (10·log10) or voltage (20·log10) ratios.

Power vs voltage?

Power uses ×10, voltage/amplitude uses ×20.

3 dB?

Doubling of power.

Negative dB?

Ratio below one — attenuation, not gain.