Decibel Voltage Ratio Calculator
Turn a voltage ratio into decibels (dB).
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator uses the field-quantity decibel formula, dB = 20 × log₁₀(Vout / Vin), which differs from the power-ratio formula (10 × log₁₀) by a factor of two because power is proportional to voltage squared. A ratio of exactly 2 (doubling the voltage) works out to about +6.02 dB, and a ratio of 10 works out to exactly +20 dB.
Audio engineers use it to read gain and attenuation straight off an amplifier's or mixer's voltage figures, electronics designers use it to spec op-amp and filter circuits in datasheets, and it's the same math behind the dB markings on volume knobs and equalizer sliders.
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