This online calculator is designed to assess combined hearing loss, serving as a foundational tool for determining the extent of compensation claims.

It primarily evaluates sensorineural hearing loss (SNHL), typically associated with noise-induced hearing issues in workplace environments.

Instructions for Using this Hearing Loss Calculator

1. Start with the Right Ear

  • Enter Decibel Results: Begin by inputting the decibel (dB) levels for each frequency for the right ear. These levels are obtained from the Pure Tone Audiometry (PTA) results.
  • Frequencies to Enter:
    • 250Hz
    • 500Hz
    • 1000Hz
    • 2000Hz
    • 3000Hz
    • 4000Hz
    • 8000Hz
  • Calculate Average: Once all the dB levels are entered, click the Calculate button. This will compute and display the average hearing level for the right ear and generate a corresponding chart.

2. Repeat the Steps for the Left Ear

  • Enter Decibel Results: Follow the same steps as for the right ear. Input the dB levels for each frequency for the left ear based on the PTA results.
  • Calculate Average: After entering all the dB levels, click the Calculate button for the left ear. This will compute and display the average hearing level for the left ear and produce a chart for visualization.

3. Calculate Combined Hearing Loss

  • Final Calculation: After completing the calculations for both the right and left ears, click on the Calculate Combined Hearing Loss button. This will provide an overall assessment of your hearing loss level by combining the data from both ears.

Left Ear



Evidence

This online calculator is designed to assess combined hearing loss, using input from Pure Tone Audiometry (PTA).

PTA is the principal hearing test for identifying an individual's hearing threshold levels and is considered the gold standard for determining the degree and type of hearing loss.

The calculation of combined hearing loss adheres to ANSI - ASAstandards, which are widely used for assessing hearing impairment and determining compensation.

FORMULA

Calculating the Combined Hearing Loss (The hearing handicap)
Calculating the combined hearing loss to determine the magnitude of a compensation claim.

  1. The mean of the hearing thresholds for each ear at 500 Hz, 1 kHz, 2 kHz, and 3 kHz determine the pure-tone audiometry threshold average. 
  2. The monaural hearing impairment for each ear is calculated by subtracting 25 dB from the pure-tone audiometry threshold average calculated in Step 1 and multiplying the result by 1.5. This calculation assumes that hearing loss becomes a handicap beyond 25 dB.
  3. The hearing handicap is calculated by multiplying the better ear impairment percentage by 5, adding this to the worse ear impairment percentage, and dividing the total by 6.
REFERENCE

The table below shows one commonly used hearing loss classification system.

Degree of hearing loss Hearing loss range (in dB HL)
Normal –10 to 15
Slight 16 to 25
Mild 26 to 40
Moderate 41 to 55
Moderately severe 56 to 70
Severe 71 to 90
Profound 91+
Note. dB HL = decibels in hearing level. Adapted from Clark (1981).

Founder

ASA and ANSI

The Acoustical Society of America (ASA) is a prominent scientific membership society dedicated to increasing and diffusing the knowledge of acoustics and its practical applications. Founded in 1929, the ASA brings together professionals from various disciplines related to the science of sound, including physics, engineering, psychology, biology, speech and hearing, and even music.
The society is involved in the development of acoustical standards in collaboration with other organizations such as ANSI. These standards are crucial for ensuring consistency and quality in acoustical products and research across multiple fields, including noise control, hearing conservation, architectural acoustics, and underwater acoustics, among others.
The American National Standards Institute (ANSI) is a non-profit organization that was founded in 1918. Its main role is to oversee the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States.
ANSI is actively involved in accrediting organizations that conduct product or personnel certification in accordance with requirements defined in international standards. The institute represents the United States in the International Organization for Standardization (ISO) and, via the U.S. National Committee, in the International Electrotechnical Commission (IEC). Through its membership, ANSI promotes U.S. policy and technical positions in international and regional standards organizations.


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