Decibel Converter
Convert decibels to power ratio, voltage ratio and nepers — type one value and see the equivalent in every unit, useful for audio, telecom and engineering work.
Result will appear here.
How to use
- Enter a value or select an option.
- Choose the From and To units — the result updates live.
- See the converted values in all units below.
Note: for power, dB = 10 log10(ratio); for voltage, dB = 20 log10(ratio). 1 Np = 8.686 dB.
Tips
- For power, dB = 10 × log₁₀(ratio); for voltage or current, dB = 20 × log₁₀(ratio).
- A 3 dB gain doubles power; a 10 dB gain multiplies it by 10.
- Negative dB values just mean the ratio is below 1 — that is normal.