Decibel Table

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Decibel Reference Table

📊 Decibel Reference Table

dB = 10·log₁₀(P₂/P₁) for power, dB = 20·log₁₀(V₂/V₁) for voltage/current

dB	Power Ratio	Voltage Ratio	Meaning
-20	0.01	0.1	1/100 power, 1/10 voltage
-17	0.02	0.141
-14	0.04	0.2
-10	0.1	0.316	1/10 power
-9	0.126	0.355
-6	0.25	0.5	Quarter power, half voltage
-3	0.5	0.707	Half power (−3dB point)
-2	0.631	0.794
-1	0.794	0.891
0	1.0	1.0	Reference (unity)
+1	1.259	1.122
+2	1.585	1.259
+3	2.0	1.414	Double power
+6	4.0	2.0	4× power, 2× voltage
+9	7.94	2.818
+10	10.0	3.162	10× power
+12	15.85	3.981
+14	25.12	5.012
+17	50.12	7.079
+20	100.0	10.0	100× power, 10× voltage
+30	1000	31.62	1000× power
+40	10000	100.0	10000× power
+50	100000	316.2	100000× power
+60	1000000	1000	1 million × power

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