Volt and Power DB Conversion Page


Determine the ratio of output to input voltage or power and find this value on the chart below. Then look accross to find the value of DB gain or attenuation.



Chart of Voltage and Power Ratios and Their DB Values.

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Voltage GainPower Gain DB ValuePower Atten. Voltage Atten.
1 1 0 1 1
1.059 1.122 0.5 0.8913 0.9441
1.122 1.259 1 0.7943 0.8913
1.189 1.413 1.5 0.7079 0.8414
1.259 1.585 2 0.631 0.7943
1.334 1.778 2.5 0.5623 0.7499
1.413 1.995 3 0.5012 0.7079
1.496 2.239 3.5 0.4467 0.6683
1.585 2.512 4 0.3981 0.631
1.679 2.818 4.5 0.3548 0.5957
1.778 3.162 5 0.3162 0.5623
1.884 3.548 5.5 0.2818 0.5309
1.995 3.981 6 0.2512 0.5012
2.113 4.467 6.5 0.2239 0.4732
2.239 5.012 7 0.1995 0.4467
2.371 5.623 7.5 0.1778 0.4217
2.512 6.31 8 0.1585 0.3981
2.661 7.079 8.5 0.1413 0.3758
2.818 7.943 9 0.1259 0.3548
2.985 8.913 9.5 0.1122 0.335
3.162 10 10 0.1 0.3162
3.35 11.22 10.5 0.08913 0.2985
3.548 12.59 11 0.07943 0.2818
3.758 14.13 11.5 0.07079 0.2661
3.981 15.85 12 0.0631 0.2512
4.217 17.78 12.5 0.05623 0.2371
4.467 19.95 13 0.05012 0.2239
4.732 22.39 13.5 0.04467 0.2113
5.012 25.12 14 0.03981 0.1995
5.309 28.18 14.5 0.03548 0.1884
5.623 31.62 15 0.03162 0.1778
5.957 35.48 15.5 0.02818 0.1679
6.31 39.81 16 0.02512 0.1585
6.683 44.67 16.5 0.02239 0.1496
7.079 50.12 17 0.01995 0.1413
7.499 56.23 17.5 0.01778 0.1334
7.943 63.1 18 0.01585 0.1259
8.414 70.79 18.5 0.01413 0.1189
8.913 79.43 19 0.01259 0.1122
9.441 89.13 19.5 0.01122 0.1059
10 100 20 0.01 0.1
31.62 1000 30 0.001 0.03162
100 1.00E+04 40 0.0001 0.01
316.2 1.00E+05 50 1.00E-05 0.003162
1000 1.00E+06 60 1.00E-06 0.001
3162 1.00E+07 70 1.00E-07 0.0003162
1.00E+04 1.00E+08 80 1.00E-08 0.0001
3.16E+04 1.00E+09 90 1.00E-09 3.16E-05
1.00E+05 1.00E+10 100 1.00E-10 1.00E-05
3.16E+05 1.00E+11 110 1.00E-11 3.16E-06


Notes:
#1. Voltage ratio values are calculated by the following formula: DB(volt) = 20*log(Vout/Vin)
#2. Power ratio values are calculated by the following formula: DB(pwr) = 10*log(Pout/Pin)
#3. These values are for educational purposes only.
Due to the wide range of circuit applications, the author assumes no responsibility for the application of these values.


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