Below, you will find a chart that will help you to calculate the sound power.


Sound power

 Theoretical average sound pressure level [dB(A)]

LWA 1m 3m 4m 5m 7m 8m 9m 15m 16m 30.5m
80 72 62.5 60 58 55.1 54 53 48.5 47.9 42.3
85 77 67.5 65 63 60.1 59 58 53.5 52.9 47.3
90 82 72.5 70 68 65.1 64 63 58.5 57.9 52.3
95 87 77.5 75 73 70.1 69 68 63.5 62.9 57.3
100 92 82.5 80 78 75.1 74 73 68.5 67.9 62.3
105 97 87.5 85 83 80.1 79 78 73.5 72.9 67.3
110 102 92.5 90 88 85.1 84 83 78.5 77.9 72.3
115 107 97.5 95 93 90.1 89 88 83.5 82.9 77.3
120 112 102.5 100 98 95.1 94 93 88.5 87.9 82.3
reduction 8 17.5 20 22 24.9 26 27 31.5 32.1 37.7


LWA95 corresponds to 70dB(A) at 7m from the noise source.
72dB(A) at 7m from the noise source corresponds to LWA97.
For some daily examples, check the decibel chart.

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