Decibel calculator decibels converter audio engineering - sengpielaudio Checker
 
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How to calculate dB?
• The decibel  calculator  (dB) - a valuable tool •

dB
ratio
field quantity energy quantity
 
             

With "dB" and "ratio" near the input boxes, you decide what is calculated and which box is the input.
With quantity of a "field" and quantity of "energy" you decide if it is 20 times (field, e.g. volts) or 10 times (energy, e.g. watts) in the formula.
The bar changes plus and minus, when dB is
chosen, it makes the reciprocal, when ratio is chosen.

Room Modes - sengpielaudio

The formulas for voltage and power
and the calculation

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 LV (audio):
dBu
Formula voltage   Formula voltage level
Reference voltage V0 = 0.7746 volt ≡ 0 dBu
Voltage V:
volts		  ↔  Voltage level LV:
dBV
Formula voltage   Formula voltage level
Reference voltage V0 = 1 volt ≡ 0 dBV
Electric power P:
watts		  ↔  Electric Power level LP
dB
Formula power   Formula power level
Reference power P0 = 1 watt ≡ 0 dB

dBm indicates that the reference power is P0 = 1 milliwatt = 0.001 watt ≡ 0 dBm.

Electric power P (telephone):
watts		  ↔  Electric Power level LP
dBm
Formula power telephone   Formula power level
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 of energy quantities
Formula power level

Sound pressure, sound intensity, and their levels:
Conversions and calculations of sound quantities and their levels

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

Pegel in dB - sengpielaudio

Faktor - sengpielaudio

a1 and b1 is the reference
'a' could be a voltage V and 'b' could be a power P.    P ~ V2

 Sound pressure 
 Sound field size		 Formula sound pressure           Sound pressure level 
 		 Formula sound pressure level

Reference sound pressure p0 = 20 μPa = 2 × 10-5 Pa ≡ 0 dB
Field quantities, as the sound pressure, will always be shown as RMS value.

Sound intensity 
Sound energy size 		 Formula intensity Sound intensity level 
 		 Formula intensity level
Reference sound intensity I0 = 1 × 10-12 W/m2 ≡ 0 dB

Decibel scale for linear field quantities, like volts and sound pressures
dB-Ratio - sengpielaudio
The logarithmic scale (ratio)

 
 Note - Comparing dB and dBA: There is no conversion formula for
 measured dBA values to sound pressure level dBSPL or vice versa. 
 

3 dB mean voltage related to a ratio of the factor √2 = 1.4142 or 1 / √2 = 0.7071.
Voltage level

3 dB mean power (energy) relatedto a ratio with the factor 2 (doubling) or 0.5 (half).
Power level

 
Note: The radiated sound power (sound intensity) is the cause -
and the sound pressure is the effect.
The effect is of particular interest to the sound engineer.
The effect of temperature and sound pressure.
 

 
Acousticians and sound protectors (noise fighters) need the
sound intensity (acoustic intensity). As a sound designer you
don't need that. Look out more for the sound pressure as an
effect at your ears and at the microphones.
 

Sound pressure and sound power

Charts: Conversion of voltage or power ratios to decibels dB
Decibel (dB) level conversion to volt
Conversion: Voltage V to Level dB, dBu, dBV, and dBm

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