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C Weighting  The C-weighting curve approximately follows the 100 phon curve.
The C-weighting is described by the equation below:  where - WC = weighting to be applied, dB
- f = frequency, Hz
Enter frequency and level in either dB or dB(B) to get conversion and weighting or frequency only to get weighting. | |
The following are tabulated standard C weighting values for the 1/3 Octave centre frequencies. | Frequency | C-wgt | Frequency | C-wgt | | 20 | -6.2 | 800 | 0.0 | | 25 | -4.4 | 1000 | 0.0 | | 31.5 | -3.0 | 1250 | 0.0 | | 40 | -2.0 | 1600 | -0.1 | | 50 | -1.3 | 2000 | -0.2 | | 63 | -0.8 | 2500 | -0.3 | | 80 | -0.5 | 3150 | -0.5 | | 100 | -0.3 | 4000 | -0.8 | | 125 | -0.2 | 5000 | -1.3 | | 160 | -0.1 | 6300 | -2.0 | | 200 | 0.0 | 8000 | -3.0 | | 250 | 0.0 | 10000 | -4.3 | | 315 | 0.0 | 12500 | -6.2 | | 400 | 0.0 | 16000 | -8.5 | | 500 | 0.0 | 20000 | -11.2 | | 630 | 0.0 | | | The s-domain transfer function is:  - where s is the complex variable.
See also: A Weighting, B Weighting, G Weighted Overall Level.
  
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