Appendix D
CONVERSION FROM POWER OR VOLTAGE RATIOS TO DECIBELS
Voltage or Pressure Ratio Power or Intensity Ratio <--- - dB + ---> Voltage or Pressure Ratio Power or Intensity Ratio 1.000 1.000 0 1.000 1.000 0.989 0.977 0.1 1.012 1.023 0.977 0.955 0.2 1.023 1.047 0.966 0.933 0.3 1.035 1.072 0.955 0.912 0.4 1.047 1.096 0.944 0.891 0.5 1.059 1.122 0.933 0.871 0.6 1.072 1.148 0.923 0.851 0.7 1.084 1.175 0.912 0.832 0.8 1.096 1.202 0.902 0.813 0.9 1.109 1.230 0.891 0.794 1.0 1.122 1.259 0.841 0.708 1.5 1.189 1.413 0.794 0.631 2.0 1.259 1.585 0.750 0.562 2.5 1.334 1.778 0.708 0.501 3.0 1.413 1.995 0.668 0.447 3.5 1.496 2.239 0.631 0.398 4.0 1.585 2.512 0.596 0.355 4.5 1.679 2.818 0.562 0.316 5.0 1.778 3.162 0.531 0.282 5.5 1.884 3.548 0.501 0.251 6.0 1.995 3.981 0.473 0.224 6.5 2.113 4.467 0.447 0.200 7.0 2.239 5.012 0.422 0.178 7.5 2.371 5.623 0.398 0.159 8.0 2.512 6.310 0.376 0.141 8.5 2.661 7.079 0.355 0.126 9.0 2.818 7.943 0.335 0.112 9.5 2.985 8.913 0.316 0.100 10 3.162 10.00 0.282 0.0794 11 3.55 12.6 0.251 0.0631 12 3.98 15.9 0.224 0.0501 13 4.47 20.0 0.200 0.0398 14 5.01 25.1 0.178 0.0316 15 5.62 31.6 0.159 0.0251 16 6.31 39.8 0.141 0.0200 17 7.08 50.1 0.126 0.0159 18 7.94 63.1 0.112 0.0126 19 8.91 79.4 0.100 0.0100 20 10.0 100.0 3.16 x 10-2 10-3 30 3.16 x 10 103 10-2 10-4 40 102 104 3.16 x 10-3 10-5 50 3.16 x 102 105 10-3 10-6 60 103 106 3.16 x 10-4 10-7 70 3.16 x 103 107 10-4 10-8 80 104 108 3.16 x 10-5 10-9 90 3.16 x 104 109 10-5 10-10 100 105 1010 3.16 x 10-6 10-11 110 3.16 x 105 1011 10-6 10-12 120 106 1012
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