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Online Calculator
Voltage decibels calculator
Convert between amplitude ratios and decibels using 20 log₁₀(V₂/V₁).
Uses 20 log₁₀(V₂/V₁), suitable for amplitude ratios at equivalent impedances.
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Frequently asked questions
What's the formula?
dB = 20 log₁₀(V₂/V₁).
What ratio corresponds to approximately 6.02 dB?
An amplitude ratio of approximately 2 to 1.
Why is 20 and not 10 used?
Because this calculation uses amplitudes at equivalent impedances.
Does it work in both directions?
Yes.