Decibel

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dB Pouer ratio Amplitude ratio
100   10000000000 100000
90 1000000000 31623
80 100000000 10000
70 10000000 3162
60 1000000 1000
50 100000 316 .2
40 10000 100
30 1000 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 ≈ 12 0 .708
−6 0 .251 0 .501 ≈ 12
−10 0 .1 0 .3162
−20 0 .01 0 .1
−30 0 .001 0 .03162
−40 0 .0001 0 .01
−50 0 .00001 0 .003162
−60 0 .000001 0 .001
−70 0 .0000001 0 .0003162
−80 0 .00000001 0 .0001
−90 0 .000000001 0 .00003162
 −100 0 .0000000001 0 .00001
An example scale shawin pouer ratios x an amplitude ratios x an dB equivalents 10 log10 x. It is easier tae grasp an compare 2- or 3-deegit nummers nor tae compare up tae 10 deegits.

The decibel (dB) is a logarithmic unit uised tae express the ratio o twa values o a pheesical quantity, eften pouer or intensity.