| Deutsche Version |
The dB calculator - a valuable tool
Conversion of voltage or power ratios to decibels dB
Table and chart - volts, watts, and pascals, W/m2
The sound pressure deviation is the instantaneous acoustic pressure as RMS value.
| Voltage or sound pressure ratio | Power or intensity ratio | ← − dB + → | Voltage or sound pressure ratio | Power or intensity ratio |
| 1.000 | 1.000 | 0 | 1.000 | 1.000 |
| 0.989 | 0.977 | 0.1 | 1.012 | 1.023 |
| 0.977 | 0.955 | 0.2 | 1.023 | 1.047 |
| 0.966 | 0.933 | 0.3 | 1.035 | 1.072 |
| 0.955 | 0.912 | 0.4 | 1.047 | 1.096 |
| 0.944 | 0.891 | 0.5 | 1.059 | 1.122 |
| 0.933 | 0.871 | 0.6 | 1.072 | 1.148 |
| 0.923 | 0.851 | 0.7 | 1.084 | 1.175 |
| 0.912 | 0.832 | 0.8 | 1.096 | 1.202 |
| 0.902 | 0.813 | 0.9 | 1.109 | 1.230 |
| 0.891 | 0.794 | 1.0 | 1.122 | 1.259 |
| 0.841 | 0.708 | 1.5 | 1.189 | 1.413 |
| 0.794 | 0.631 | 2.0 | 1.259 | 1.585 |
| 0.750 | 0.562 | 2.5 | 1.334 | 1.778 |
| 0.707 | 0.501 | 3.0 | 1.413 | 1.995 |
| 0.668 | 0.447 | 3.5 | 1.496 | 2.239 |
| 0.631 | 0.398 | 4.0 | 1.585 | 2.512 |
| 0.596 | 0.355 | 4.5 | 1.679 | 2.818 |
| 0.562 | 0.316 | 5.0 | 1.778 | 3.162 |
| 0.531 | 0.282 | 5.5 | 1.884 | 3.548 |
| 0.501 | 0.250 | 6.0 | 1.995 | 4.000 |
| 0.473 | 0.224 | 6.5 | 2.113 | 4.467 |
| 0.447 | 0.200 | 7.0 | 2.239 | 5.012 |
| 0.422 | 0.178 | 7.5 | 2.371 | 5.623 |
| 0.398 | 0.159 | 8.0 | 2.512 | 6.310 |
| 0.376 | 0.141 | 8.5 | 2.661 | 7.079 |
| 0.355 | 0.126 | 9.0 | 2.818 | 7.943 |
| 0.335 | 0.112 | 9.5 | 2.985 | 8.913 |
| 0.316 | 0.100 | 10 | 3.162 | 10.00 |
| 0.282 | 0.0794 | 11 | 3.55 | 12.6 |
| 0.251 | 0.0631 | 12 | 3.98 | 15.8 |
| 0.224 | 0.0501 | 13 | 4.47 | 20.0 |
| 0.199 | 0.0398 | 14 | 5.01 | 25.1 |
| 0.178 | 0.0316 | 15 | 5.62 | 31.6 |
| 0.159 | 0.0251 | 16 | 6.31 | 39.8 |
| 0.141 | 0.0200 | 17 | 7.08 | 50.1 |
| 0.126 | 0.0159 | 18 | 7.94 | 63.1 |
| 0.112 | 0.0126 | 19 | 8.91 | 79.4 |
| 0.100 | 0.0100 | 20 | 10.0 | 100.0 |
| 3.16×10−2 | 10−3 | 30 | 3.16×10 | 103 |
| 10−2 = 0.01 | 10−4 | 40 | 102 = 100 | 104 |
| 3.16×10−3 | 10−5 | 50 | 3.16×102 | 105 |
| 10−3 = 0.001 | 10−6 | 60 | 103 = 1000 | 106 |
| 3.16×10−4 | 10−7 | 70 | 3.16×103 | 107 |
| 10−4 | 10−8 | 80 | 104 | 108 |
| 3.16×10−5 | 10−9 | 90 | 3.16×104 | 109 |
| 10−5 | 10−10 | 100 | 105 | 1010 |
| 3.16×10−6 | 10−11 | 110 | 3.16×105 | 1011 |
| 10−6 | 10−12 | 120 | 106 | 1012 |
| Enter a value in the left or right box, then press the TAB bar or make a mouse click at an empty space at the side, to get the solution. The calculator works in both directions of the ↔ sign. |
For dBm it was decided a reference power P0 = 1 milliwatt (mW) = 0.001 W ≡ 0 dB
|
|
||
| Level of Field Quantities |
Level of Energy Quantities |
| We are mainly concerned with conditions of sound pressure, sound velocity, and sound voltage. That are the sound field quantities. Voltage level is: LV = 20 × log (V1 / V0) Reference voltage V0 = 1 Volt. Voltage: V1 = V0 × 10(LV / 20) |
| Sound Field Quantities
Sound pressure, sound or particle velocity, particle displacement or particle ampliude, (voltage, current, electric resistance). Inverse Distance Law 1/r |
Sound Energy Quantities Sound intensity, sound energy density, sound energy, acoustic power. (electrical power). Inverse Square Law 1/r² |
![]() |
Absolute level - dB chart
referred to 0.7746 volt in dBu and to 1 volt in dBV
Conversion of decibel to voltage re 0.7746 volt and re 1 volt
| Voltage re 0.7746 volt |
Voltage re 1 volt |
← – dB + → | Voltage re 0.7746 volt |
Voltage re 1 volt |
| 0.775 | 1.000 | 0 | 0.775 | 1.000 |
| 0.766 | 0.989 | 0.1 | 0.784 | 1.012 |
| 0.757 | 0.977 | 0.2 | 0.793 | 1.023 |
| 0.748 | 0.966 | 0.3 | 0.802 | 1.035 |
| 0.740 | 0.955 | 0.4 | 0.811 | 1.047 |
| 0.731 | 0.944 | 0.5 | 0.820 | 1.059 |
| 0.723 | 0.933 | 0.6 | 0.830 | 1.072 |
| 0.715 | 0.923 | 0.7 | 0.840 | 1.084 |
| 0.706 | 0.912 | 0.8 | 0.849 | 1.096 |
| 0.698 | 0.902 | 0.9 | 0.859 | 1.109 |
| 0.690 | 0.891 | 1.0 | 0.869 | 1.122 |
| 0.652 | 0.841 | 1.5 | 0.921 | 1.189 |
| 0.615 | 0.794 | 2.0 | 0.975 | 1.259 |
| 0.581 | 0.750 | 2.5 | 1.033 | 1.334 |
| 0.548 | 0.707 | 3.0 | 1.095 | 1.414 |
| 0.518 | 0.668 | 3.5 | 1.159 | 1.496 |
| 0.489 | 0.631 | 4.0 | 1.228 | 1.585 |
| 0.461 | 0.596 | 4.5 | 1.300 | 1.679 |
| 0.436 | 0.562 | 5.0 | 1.377 | 1.778 |
| 0.411 | 0.531 | 5.5 | 1.459 | 1.884 |
| 0.388 | 0.501 | 6.0 | 1.549 | 1.995 |
| 0.367 | 0.473 | 6.5 | 1.637 | 2.113 |
| 0.346 | 0.447 | 7.0 | 1.734 | 2.239 |
| 0.327 | 0.422 | 7.5 | 1.837 | 2.371 |
| 0.308 | 0.398 | 8.0 | 1.946 | 2.512 |
| 0.291 | 0.376 | 8.5 | 2.061 | 2.661 |
| 0.275 | 0.355 | 9.0 | 2.183 | 2.818 |
| 0.259 | 0.335 | 9.5 | 2.312 | 2.985 |
| 0.245 | 0.316 | 10 | 2.449 | 3.162 |
| 0.218 | 0.282 | 11 | 2.748 | 3.548 |
| 0.195 | 0.250 | 12 | 3.084 | 3.981 |
| 0.173 | 0.224 | 13 | 3.460 | 4.467 |
| 0.155 | 0.199 | 14 | 3.882 | 5.012 |
| 0.138 | 0.178 | 15 | 4.356 | 5.623 |
| 0.123 | 0.159 | 16 | 4.887 | 6.310 |
| 0.109 | 0.141 | 17 | 5.484 | 7.079 |
| 0.097 | 0.129 | 18 | 6.153 | 7.943 |
| 0.086 | 0.112 | 19 | 6.904 | 8.912 |
| 0.077 | 0.100 | 20 | 7.746 | 10.000 |
| 2.450×10−2 | 3.162×10−2 | 30 | 24.50 | 31.62 |
| 7.746×10−3 | 10−2 | 40 | 77.46 | 102 |
| 2.450×10−3 | 3.162×10−3 | 50 | 2.450×102 | 3.162×102 |
| 7.746×10−4 | 10−3 | 60 | 7.746×102 | 103 |
| 2.450×10−4 | 3.162×10−4 | 70 | 2.450×103 | 3.162×103 |
| 7.746×10−5 | 10−4 | 80 | 7.746×103 | 104 |
| 2.450×10−5 | 3.162×10−5 | 90 | 2.450×104 | 3.162×104 |
| 7.746×10−6 | 10−5 | 100 | 7.746×104 | 105 |
| 2.450×10−6 | 3.162×10−6 | 110 | 2.450×105 | 3.162×105 |
| 7.746×10−7 | 10−6 | 120 | 7.746×105 | 106 |
Audio voltage and level
| Enter a value in the left or right box, then press the TAB bar or make a mouse click at an empty space at the side, to get the solution. The calculator works in both directions of the ↔ sign. |
| Note - Comparing dBSPL and dBA: There is no conversion formula for measured dBA values to sound pressure level dBSPL or vice versa. That is only possible measuring one single frequency. There is no "dBA" curve given as threshold of human hearing. |
| Words to the wise: Always wonder what a manufacturer is hiding when they use A-weighting. *) |
*) http://www.google.com/search?q=Always+wonder+what+a+manufacturer+Rane&filter=0
Readings of a pure 1 kHz tone should be identical, whether weighted or not.
Sound measuring (Noise measuring) with weighting filter A and C
| back |
Search engine |
home |