Convert decibels (dB) to percentage (%) — and back. Results shown for both amplitude and power ratios instantly.
| dB | Amplitude % (Voltage/Pressure) | Power % (Energy/Intensity) | Common Use |
|---|---|---|---|
| +6 dB | 199.526% | 398.1072% | Double voltage / 4× power |
| +3 dB | 141.254% | 199.5262% | Half power increase (+1.41× amp) |
| 0 dB | 100.000% | 100.0000% | Reference level (no change) |
| -1 dB | 89.125% | 79.4328% | Slight reduction |
| -3 dB | 70.795% | 50.1187% | Half power (−29.3% amp) |
| -6 dB | 50.119% | 25.1189% | Half amplitude / ¼ power |
| -10 dB | 31.623% | 10.0000% | 1/10 power (31.6% amp) |
| -20 dB | 10.000% | 1.0000% | 10% amplitude / 1% power |
| -40 dB | 1.000% | 0.0100% | 1% amplitude / 0.01% power |
| -60 dB | 0.100% | 0.0001% | 0.1% amp / 0.0001% power |