Decibel Calculator
Convert between decibels and linear ratios for power and voltage.
Decibel Conversion
Result
10.00
dB
10.0000
Linear Ratio
Common dB Values
| dB | Power | Voltage |
|---|---|---|
| -20 | 0.01 | 0.100 |
| -10 | 0.1 | 0.316 |
| -6 | 0.25 | 0.500 |
| -3 | 0.5 | 0.707 |
| 0 | 1 | 1.000 |
| 3 | 2 | 1.414 |
| 6 | 4 | 2.000 |
| 10 | 10 | 3.160 |
| 20 | 100 | 10.000 |
Formulas
Power: dB = 10 * log10(P1/P2)
Voltage: dB = 20 * log10(V1/V2)
dBm = 10 * log10(P / 1mW)
dBV = 20 * log10(V / 1V)
dBu = 20 * log10(V / 0.775V)