addition of noise levels Noise 1:  dB Noise 2:  dB Noise 3:  dB Noise 4:  dB Noise 5:  dB Noise 6:  dB Noise 7:  dB Noise 8:  dB Noise 9:  dB Resultant Noise Level:  dB   The addition of Decibels is not a simple task, as the Decibel scale is logarithmic. The above calculator allows you to input a number of noise levels and provides the added resultant noise level expected. Possible uses of this calculator include: Determining the possible total noise level from running several machines, with a known noise output, at the same time. Determine the resultant noise level if a new machine is added to an existing noisy area. Determine the effect that background noise levels will have on the overall noise level.