Overall Noise Rating Results


Suitable Environment Type



Noise Level Values


Noise Rating Chart


NR Ranges and Environment Types


About Noise Rating (NR)

Noise Rating (NR) is a standard that represents the levels of noise in different frequency bands.

It's used to specify acceptable indoor environment and noise levels in buildings.

The NR rating is determined by plotting the octave band levels for a given noise spectrum against a family of NR curves. The NR value is the highest curve that is reached by the noise spectrum.

Common applications include:

  • Building design and acoustics
  • HVAC system noise evaluation
  • Office and workspace noise assessment
  • Determining appropriate environments for different activities