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Noise Criterion (NC) - Free Online Calculator

Calculate Noise Criterion (NC) from octave band pressure levels.

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The calculator below can used to calculate the NC - Noise Criterion:

Sound Pressure Level (dB) - Octave band mid-frequency (Hz)

63 Hz (upper limit 83 dB)

125 Hz (upper limit 79 dB)

250 Hz (upper limit 75 dB)

500 Hz (upper limit 72 dB)

1000 Hz (upper limit 71 dB)

2000 Hz (upper limit 70 dB)

4000 Hz (upper limit 69 dB)

8000 Hz (upper limit 68 dB)

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The NC-diagram with the default values from above:

nc - noise criteria - example

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