Decibel Calculators

dB
factor (ratio)
field size energy size
dB:   
Voltage Gain:   
Power Gain:   
 
dBm:    
Power:    
Voltage:
Load = ohms
 

The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity, often power or intensity.

dB power ratio amplitude ratio
100   10 000 000 000   100 000  
90 1 000 000 000   31 623  
80 100 000 000   10 000  
70 10 000 000   3 162  
60 1 000 000   1 000  
50 100 000   316 .2
40 10 000   100  
30 1 000   31 .62
20 100   10  
10 10   3 .162
6 3 .981 1 .995 (~2)
3 1 .995 (~2) 1 .413
1 1 .259 1 .122
0 1   1  
-1 0 .794 0 .891
-3 0 .501 (~1/2) 0 .708
-6 0 .251 0 .501 (~1/2)
-10 0 .1 0 .316 2
-20 0 .01 0 .1
-30 0 .001 0 .031 62
-40 0 .000 1 0 .01
-50 0 .000 01 0 .003 162
-60 0 .000 001 0 .001
-70 0 .000 000 1 0 .000 316 2
-80 0 .000 000 01 0 .000 1
-90 0 .000 000 001 0 .000 031 62 
 -100 0 .000 000 000 1 0 .000 01

Enter any one value and click on calculate button. Result will be displayed.

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The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity, often power or intensity
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