dB calculator - dB calculation voltage power ratio - sengpielaudio
dB decibel calculate calculation calculator computation calculate calculation convert conversion factor ratio voltage power reference value level acoustic velocity sound distance electrical resistance voltage power ratio sound pressure level matching dBA dB SPL sound pressure intensity ratios energy loudness sound energy density audio reference field energy quantity quantities field energy quantity value magnitude table tables chart charts sound studio techniques acoustics volts volt watts watt sound pressure intensity sengpielaudio Sengpiel Berlin
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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 "field quantity " and "energy quantity " you decide if it is
20 times (field quantity, e.g. volts) or 10 times (energy quantity, e.g. watts) in the formula.
The bar changes plus and minus, when dB is
chosen, it makes the reciprocal, when ratio is chosen.

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):
Volt
 ↔  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:
Volt
 ↔  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)
Electric power P:
Watt
 ↔  Electric Power level LP
dB
Start   Start
Reference power P0 = 1 W (0 dB)

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

Sound pressure, sound intensity, and their levels:
Conversion: dBu in volts, dBV in volts, volts in dBu and dBV

Sound Field Quantities    :-)
sound pressure, sound velocity, particle displacement, sound distance, voltage, current, electric resistance.
Inverse Distance Law 1/r
Sound Energy Quantities
Sound intensity, sound power, sound energy density, electric 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
Start           Sound pressure level 
 
Start

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


Sound intensity 
Sound energy size 
Start Sound intensity Level 
 
Start
Reference sound intensity I0 = 1 × 10-12 W/m2 (0 dB)

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

There is no decibel conversion from dBA to dBSPL or vice versa.

Charts: Conversion of voltage or power ratios to decibels dB

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