Voltage · Power · SPL · Conversions
dB = 20 × log₁₀(V₁/V₂) — Enter any two values to solve for the third
dB = 10 × log₁₀(P₁/P₂) — Enter any two values to solve for the third
dB SPL from pressure (Pa), reference 20µPa
Enter one value to get all conversions
Add 2-10 sources (acoustic sum, not arithmetic)
SPL at distance given SPL at reference distance
Quick converter between dB and ratios
Given max level and operating level, show headroom
SVG meter showing dB level with color zones
Standard audio reference levels and conversions
| Reference | dBu | dBV | Voltage (V) | Application |
|---|---|---|---|---|
| 0 dBu | 0 | -2.2 | 0.775 | Professional line level |
| 0 dBV | +2.2 | 0 | 1.000 | Reference voltage |
| +4 dBu | +4 | +1.8 | 1.228 | Pro equipment nominal |
| -10 dBV | -7.8 | -10 | 0.316 | Consumer equipment nominal |
| 0 dBFS | varies | varies | varies | Digital full scale |
| Mic Level | -60 to -20 | -62 to -22 | 0.0008 to 0.08 | Microphone output |
| Instrument Level | -20 to -10 | -22 to -12 | 0.08 to 0.25 | Guitar, bass, synth |
| Speaker Level | +10 to +30 | +8 to +28 | 2.4 to 25 | Power amplifier output |