ConverterHub

dB to Power Ratio Calculator

Enter the values to get the power ratio.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The decibel is a logarithmic unit for comparing two power levels: dB = 10·log₁₀(P₂/P₁). Reversing the formula gives the power ratio directly from a dB value: ratio = 10^(dB/10); because power is proportional to the square of amplitude, the corresponding amplitude (voltage/pressure) ratio is 10^(dB/20).

Audio engineers use this to translate a mixer's gain or attenuation setting into an actual multiplication factor, RF and telecom engineers use it to work out how much a signal has been amplified or lost across an amplifier or cable run, and acousticians use it to relate sound level readings to real sound-power ratios.

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