Hearing Loss Calculator — dB Loss & Severity Grade
Enter your audiogram thresholds to calculate average hearing loss in decibels and see whether it falls in the mild, moderate, or severe range.
Reviewed for accuracy by Rahul Singh, Health & Wellness Specialist
Medical disclaimer: This calculator is provided for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Results are general estimates and may not reflect your individual circumstances. Always consult a qualified healthcare professional before making decisions about your health.
Hearing Loss Calculator — dB Loss & Severity Grade
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Formula: PTA = (500 Hz + 1000 Hz + 2000 Hz) / 3 | Monaural % = (PTA - 25) x 1.5 | Binaural = (5 x Better + Worse) / 6
Worked example — Left: Mild (PTA 30.0 dB) | Right: Slight (PTA 25.0 dB) | Binaural impairment: 1.25%
Formula
PTA = (500 Hz + 1000 Hz + 2000 Hz) / 3 | Monaural % = (PTA - 25) x 1.5 | Binaural = (5 x Better + Worse) / 6
Where PTA = Pure Tone Average across speech frequencies, Monaural impairment uses 25 dB as the low fence and 1.5% per dB above it, and Binaural impairment weights the better ear 5:1 against the worse ear per AMA guidelines.
Worked Examples
Example 1: Mild Bilateral Hearing Loss Assessment
Problem:Left ear: 500 Hz = 25 dB, 1000 Hz = 30 dB, 2000 Hz = 35 dB, 4000 Hz = 45 dB. Right ear: 500 Hz = 20 dB, 1000 Hz = 25 dB, 2000 Hz = 30 dB, 4000 Hz = 40 dB. Age 55.
Solution:Left PTA = (25 + 30 + 35) / 3 = 30.0 dB (Mild loss) Right PTA = (20 + 25 + 30) / 3 = 25.0 dB (Slight loss) Better ear PTA = 25.0 dB Monaural Impairment Left: (30 - 25) x 1.5 = 7.5% Monaural Impairment Right: (25 - 25) x 1.5 = 0.0% Binaural: (5 x 0.0 + 7.5) / 6 = 1.25% High-frequency slope Left: 45 - 25 = 20 dB (significant) High-frequency slope Right: 40 - 20 = 20 dB (significant) Age-expected 4000 Hz threshold: 22.5 dB (both ears worse than expected)
Result:Left: Mild (PTA 30.0 dB) | Right: Slight (PTA 25.0 dB) | Binaural impairment: 1.25%
Example 2: Moderate Asymmetric Hearing Loss
Problem:Left ear: 500 Hz = 45 dB, 1000 Hz = 50 dB, 2000 Hz = 55 dB, 4000 Hz = 65 dB. Right ear: 500 Hz = 20 dB, 1000 Hz = 20 dB, 2000 Hz = 25 dB, 4000 Hz = 35 dB. Age 60.
Solution:Left PTA = (45 + 50 + 55) / 3 = 50.0 dB (Moderate loss) Right PTA = (20 + 20 + 25) / 3 = 21.7 dB (Slight loss) Asymmetry = |50.0 - 21.7| = 28.3 dB (SIGNIFICANT - medical evaluation needed) Monaural Left: (50 - 25) x 1.5 = 37.5% Monaural Right: (21.7 - 25) x 1.5 = 0% Binaural: (5 x 0 + 37.5) / 6 = 6.25% Speech Recognition estimate: Left ~70%, Right ~95% Recommendation: MRI to rule out acoustic neuroma
Result:Left: Moderate (PTA 50.0 dB) | Right: Slight (PTA 21.7 dB) | Asymmetric - needs medical evaluation
Frequently Asked Questions
What is Pure Tone Average and how is it calculated?
Pure Tone Average (PTA) is the average of hearing thresholds at three key speech frequencies: 500 Hz, 1000 Hz, and 2000 Hz. These frequencies were chosen because they encompass the most important range for understanding human speech. The PTA is calculated by adding the threshold values at these three frequencies and dividing by three. For example, if your thresholds are 30 dB at 500 Hz, 35 dB at 1000 Hz, and 40 dB at 2000 Hz, your PTA would be (30 + 35 + 40) / 3 = 35 dB. The PTA is the primary metric used to classify the degree of hearing loss and is closely correlated with your ability to understand conversational speech, which typically occurs at 45 to 65 dB in loudness.
What do the different degrees of hearing loss mean practically?
Normal hearing (0-15 dB PTA) means you can hear all speech sounds without difficulty. Slight loss (16-25 dB) may cause you to miss soft speech or whispers. Mild loss (26-40 dB) makes it difficult to hear soft or distant speech, especially in noisy environments, and you may frequently ask people to repeat themselves. Moderate loss (41-55 dB) means conversational speech must be loud to be heard, and you will struggle significantly without hearing aids. Moderately severe loss (56-70 dB) requires amplification for most conversations. Severe loss (71-90 dB) means you can only hear very loud sounds or amplified speech. Profound loss (91+ dB) means you cannot hear speech even with amplification and may rely primarily on visual communication or cochlear implants.
What is the AMA binaural hearing impairment calculation?
The American Medical Association (AMA) method for calculating binaural hearing impairment is used for disability determinations, workers compensation claims, and legal proceedings. First, monaural (single ear) impairment is calculated as (PTA - 25) x 1.5 percent, where 25 dB represents the low fence (minimum threshold for impairment) and the result is capped between 0 and 100 percent. Then binaural impairment is calculated using the formula (5 x better ear percentage + worse ear percentage) / 6, which weights the better ear five times more heavily because it contributes more to functional hearing. For example, if the better ear has 10 percent monaural impairment and the worse ear has 40 percent, binaural impairment equals (5 x 10 + 40) / 6 = 15 percent. This weighting reflects that losing hearing in one ear while the other functions well has less overall impact than equal bilateral loss.
What causes high-frequency hearing loss and what does it sound like?
High-frequency hearing loss, characterized by elevated thresholds at 4000 Hz and above with relatively normal low-frequency hearing, is the most common pattern of hearing loss. It is primarily caused by noise exposure (occupational or recreational), aging (presbycusis), and certain ototoxic medications. The audiogram shows a downward slope from low to high frequencies, often called a ski-slope pattern. Practically, this means you can hear the loudness of speech but miss clarity because high-frequency consonant sounds like s, f, th, sh, and h become inaudible. People with this pattern often say others seem to mumble or that they can hear but not understand. Background noise becomes especially problematic because the brain cannot distinguish speech consonants from ambient noise. This pattern is the most successfully treated with hearing aids.
What is asymmetric hearing loss and why is it significant?
Asymmetric hearing loss occurs when there is a significant difference in hearing thresholds between the two ears, typically defined as a PTA difference greater than 15 dB or a threshold difference greater than 20 dB at any single frequency. While symmetric hearing loss is usually caused by age or general noise exposure, asymmetric loss can indicate underlying medical conditions that require investigation. These include acoustic neuroma (a benign tumor on the hearing nerve), Meniere disease, sudden sensorineural hearing loss, or middle ear pathology affecting one side. Audiologists and ENT physicians will typically recommend additional testing such as MRI imaging when asymmetric hearing loss is detected. Unilateral or asymmetric loss also creates practical challenges with sound localization and understanding speech in noise, because the brain relies on comparing inputs from both ears to filter and locate sounds.
How does age-related hearing loss (presbycusis) progress over time?
Presbycusis is the gradual, progressive hearing loss that occurs with aging, affecting approximately one-third of adults between 65 and 74 and nearly half of those over 75. It typically begins with high-frequency loss, first noticeable at 8000 Hz, then progressively affecting 4000 Hz, 2000 Hz, and eventually lower frequencies over decades. On average, hearing thresholds at 4000 Hz worsen by approximately 0.5 to 1.0 dB per year after age 30, accelerating after age 60. The loss is usually bilateral and symmetric. Risk factors that accelerate presbycusis include cumulative noise exposure, cardiovascular disease, diabetes, smoking, and genetic predisposition. While presbycusis cannot be reversed, hearing aids are highly effective for compensation. Early intervention with amplification is recommended because prolonged auditory deprivation can lead to central auditory processing decline and cognitive changes.
What is the difference between conductive and sensorineural hearing loss?
Conductive hearing loss occurs when sound cannot efficiently travel through the outer ear canal, eardrum, or middle ear bones to reach the inner ear. Common causes include earwax blockage, ear infections, fluid in the middle ear, perforated eardrum, and otosclerosis (abnormal bone growth). Conductive loss is often temporary and treatable with medical or surgical intervention. Sensorineural hearing loss results from damage to the inner ear hair cells (cochlea) or the auditory nerve, and is usually permanent. It is caused by aging, noise exposure, genetics, ototoxic drugs, and certain diseases. Mixed hearing loss combines both types. An audiologist distinguishes between them by comparing air conduction thresholds (using headphones) with bone conduction thresholds (using a vibrator on the skull). If bone conduction is normal but air conduction is elevated, the loss is conductive. If both are elevated equally, it is sensorineural.
When should someone consider getting hearing aids?
Hearing aids are generally recommended when hearing loss reaches the mild to moderate range (PTA of 25-55 dB) and is affecting daily communication. Key indicators include frequently asking people to repeat themselves, turning up the television volume beyond what others find comfortable, difficulty understanding speech in restaurants or group settings, avoiding social situations due to hearing difficulty, and family members commenting on your hearing. Research strongly supports early intervention because the brain adapts to reduced auditory input over time, making it harder to adjust to amplification later. Modern hearing aids are significantly more advanced than older models, featuring directional microphones, noise reduction algorithms, Bluetooth connectivity, and rechargeable batteries. Most audiologists offer trial periods of 30 to 60 days. Studies show that hearing aid use is associated with reduced cognitive decline, lower rates of depression, and improved quality of life.
How is noise-induced hearing loss different from age-related loss?
Noise-induced hearing loss (NIHL) and age-related hearing loss (presbycusis) both affect high frequencies but have distinct characteristics on an audiogram. NIHL typically shows a distinctive notch at 4000 Hz with recovery at 8000 Hz, creating a V-shaped dip in the audiogram. This 4000 Hz notch occurs because the basilar membrane region responding to this frequency is most vulnerable to mechanical damage from loud sound. Presbycusis, in contrast, shows a gradual downward slope with progressively worsening thresholds at each higher frequency without recovery. NIHL can occur at any age from acute exposure (explosions, concerts) or chronic exposure (factory work, power tools) and can be prevented with hearing protection. The damage threshold is generally 85 dB over prolonged periods. Once NIHL occurs, it is permanent because the cochlear hair cells in mammals do not regenerate, though research into hair cell regeneration therapies is actively underway.
What does the speech recognition score tell you about hearing ability?
Speech recognition score (also called word recognition score or speech discrimination score) measures the percentage of single-syllable words you can correctly repeat when they are presented at a comfortably loud level, typically 30 to 40 dB above your PTA. Unlike the pure tone audiogram which tests sensitivity to tones, speech recognition evaluates how well the auditory system processes and distinguishes speech sounds. A score of 90 to 100 percent indicates excellent speech processing despite any hearing loss. Scores of 80 to 88 percent suggest mild difficulty. Scores below 60 percent indicate significant impairment in speech understanding that may limit hearing aid benefit. Very low scores (below 40 percent) sometimes suggest retrocochlear pathology (problems beyond the cochlea, such as an auditory nerve tumor) and warrant medical investigation. Speech recognition scores are critical for hearing aid selection because they predict how well a patient will perform with amplification and help set realistic expectations.
References
Reviewed for accuracy by Rahul Singh, Health & Wellness Specialist · Editorial policy
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