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Audiometric and Noise-Measurement Calculators

These Excel files are offered, without warranty, for the convenience of the professional community. Users should be aware of the underlying scientific and technical issues in order to apply them correctly.

Audiometric Calculators

  • BHI Calculator – computes the Binaural Hearing Impairment (BHI) according to the method of the American Medical Association (AMA) given the individual’s audiometric thresholds.
  • Audiometric Testing, Permissible-Noise Calculator – computes the maximum permissible ambient noise levels (MPANLs) that can be present during audiometric testing according to ASA/ANSI S3.1-1999 (R2018). Such values will produce negligible masking of pure-tone test signals presented as specified in ASA/ANSI S2.6-2018.

  • NIPTS Calculator - computes the expected median and 95th percentile values for noise-induced permanent threshold shift (NIPTS) for frequencies between 0.5 and 6 kHz, as well as the AMA speech frequency average, given the level and duration of an individual's noise exposure.
  • ARHL Calculator – computes the expected median and 95th percentile values of age-related hearing loss (ARHL) averaged across the AMA speech frequencies (0.5, 1, 2, and 3 kHz), given an individual's age and gender.
  • STS Expected Contributions Calculator - computes the median expected age-related hearing loss (ARHL) and noise-induced permanent threshold shift (NIPTS) during an interval over which an OSHA standard threshold shift (STS) has been observed. Inputs are gender, age at the beginning and end of the interval, and noise exposure level and duration prior to and during the interval.

Noise Measurement Calculators

  • Noise Dosimetry Data Management – takes noise dosimetry data and reported work-shift length, and normalizes the results to an 8-hour equivalent noise exposure and percent dose according to OSHA, MSHA, and ACGIH criteria.
  •  Exposure estimation – calculates the accumulated noise dose and time-weighted average (TWA) noise exposure for particular activities using OSHA, MSHA, and ACGIH criteria.
  • dB averaging – computes the logarithmic average of the input decibel values, useful for example to compute the average sound level in an area based on multiple measurements at different locations.

2021-2022 Annual Reports

Posted: March 9, 2022

The 2021-2022 Annual Reports for NHCA and the NHCA Scholarship Foundation are available on the NHCA website: 

NHCA Annual Report
NHCASF Annual Report


2022 Conference by the numbers

Posted: March 9, 2022

  • 190 total attendees
  • 27 new attendees
  • 34 presentations
  • 9 posters
  • 9 awardees

NHCA 2022 Conference Attendees - We Need Your Vote!

Posted: March 9, 2022

Please rate the presentations so we can identify the Outstanding Lecture Award and the Outstanding Poster Award winners by March 11, 2022. Click here to rate the lectures and here to rate the posters. Your input is critical!


Short NHCA Communication Survey - Please Help Us Serve You Better!

Posted: March 9, 2022

NHCA wants to improve its communications with you. We greatly appreciate you taking this short survey to help us know who we are serving and how we can improve your experience. This survey should take less than 5 minutes. Responses are needed by 3-18-2022. Thank you for your input!! Link:

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