Decibels

dB level	Power		dB level	Amplitude
–30 dB	1/1000 = 0.001		–30 dB	${\sqrt {1/1000}}$ = 0.03162
–20 dB	1/100 = 0.01		–20 dB	${\sqrt {1/100}}$ = 0.1
–10 dB	1/10 = 0.1		–10 dB	${\sqrt {1/10}}$ = 0.3162
–3 dB	ca. 1/2 = 0.5		–3 dB	${\sqrt {1/2}}$ = 0.7071
3 dB	ca. 2		3 dB	${\sqrt {2}}$ = 1.414
10 dB	10		10 dB	${\sqrt {10}}$ = 3.162
20 dB	100		20 dB	${\sqrt {100}}$ = 10
30 dB	1000		30 dB	${\sqrt {1000}}$ = 31.62