dB chart voltage power sound pressure sound intensity dB decibel level ratio table absolute relative voltage level database - sengpielaudio
 
Deutsche Version UK-flag s/w - sengpielaudio D-flag - sengpielaudio
 
Relative level - dB  chart (decibel)
and dB Conversion Calculator

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.

Voltage ratio:
V ratio		  ↔  Voltage level LV:
dB
Formula Voltage Ratio   Formula Voltage Level
Voltage ratio 1 ≡ 0 dB at reference Vin = 1 volt
Power ratio:
P ratio		  ↔  Power level LP:
dB
Formula Power Ratio   Formula Power Level
Power ratio 1 ≡ 0 dB at reference Pin = 1 watt

For dBm it was decided a reference power P0 = 1 milliwatt (mW) = 0.001 W ≡ 0 dB

Electric power (telephone) P:
watts		  ↔  Electric Power level LP
dBm
Start   Start
Reference power P0 = 1 milliwatt (mW) = 0.001 W ≡ 0 dBm
Voltage Ratio and Voltage Level - sengpielaudio
Power Ratio and Power Level - sengpielaudio
Level of Field Quantities
Formula Voltage Level - sengpielaudio
 Level of Energy Quantities
Formel Leistungspegel - Sengpielaudio

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    AnimatedLaughingSmiley
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

dB-Scale for linear field quantities, like volts and sound pressures
dB-Ratio voltage - sengpielaudio
ratio

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.
Voltage V (audio):
volts		  ↔  Voltage level LU:
dBu
V = V_0 \cdot 10^\frac{L_V}{20} \ \mbox{volts}   L_V = 20\, \log_{10}\left(\frac{V}{V_0}\right) \ \mbox{dBu}
Reference voltage V0 = 0.7746 Volt ≡ 0 dBu
Voltage V:
volts		  ↔  Voltage level LU:
dBV
V = V_0 \cdot 10^\frac{L_V}{20} \ \mbox{volts}   L_V = 20\, \log_{10}\left(\frac{V}{V_0}\right) \ \mbox{dBV}
Reference voltage V0 = 1 Volt ≡ 0 dBV
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

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