Hearing Loss Calculator
Estimate your hearing loss with our free vision & hearing calculator. See reference ranges, risk factors, and next-step guidance.
Hearing Loss Calculator
Calculate your degree of hearing loss using audiogram thresholds. Determine Pure Tone Average, AMA binaural impairment percentage, and hearing loss classification based on clinical standards.
Last updated: January 2026Reviewed by NovaCalculator Medical Editorial Team
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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.
Last reviewed: January 2026
Worked Examples
Example 1: Mild Bilateral Hearing Loss Assessment
Example 2: Moderate Asymmetric Hearing Loss
Background & Theory
The Hearing Loss Calculator applies the following established principles and formulas. Health and medicine calculators are grounded in validated physiological measurement methods established through decades of clinical research. Body Mass Index, or BMI, is calculated by dividing weight in kilograms by height in meters squared (kg/m²), a formula originating from Adolphe Quetelet's 19th-century statistical work and later codified by the WHO into standard classifications: underweight below 18.5, normal weight 18.5 to 24.9, overweight 25 to 29.9, and obese at 30 and above. Basal Metabolic Rate quantifies the minimum energy required to sustain life at rest. The Mifflin-St Jeor equation, published in 1990 and widely regarded as the most accurate for most adults, calculates BMR as (10 × weight in kg) + (6.25 × height in cm) − (5 × age) ± sex adjustment. The older Harris-Benedict equations, revised in 1984 by Roza and Shizgal, remain in common use. Total Daily Energy Expenditure is derived by multiplying BMR by a physical activity factor ranging from 1.2 for sedentary individuals to 1.9 for extremely active ones, following the methodology validated by doubly labeled water studies. Body fat percentage can be estimated without laboratory equipment using the U.S. Navy circumference method, which uses neck, waist, and hip measurements, or via BMI-derived equations adjusted for age and sex. The Jackson-Pollock skinfold method offers higher precision with calipers. Blood pressure classification, according to the American College of Cardiology and the 2017 ACC/AHA guidelines, defines normal as below 120/80 mmHg, elevated as 120 to 129 systolic, and hypertension stage 1 as 130 to 139 systolic or 80 to 89 diastolic. Target heart rate zones for aerobic exercise are derived from maximum heart rate estimates, most commonly using the formula 220 minus age in years, with moderate-intensity training typically defined as 50 to 70 percent of maximum heart rate and vigorous intensity at 70 to 85 percent, consistent with CDC and American Heart Association guidelines. These thresholds guide safe and effective cardiovascular conditioning.
History
The history behind the Hearing Loss Calculator traces back through the following developments. The history of health measurement stretches back to ancient Greece, where Hippocrates around 400 BCE laid the foundation for observational medicine by systematically recording patient symptoms, diet, and environment. His humoral theory, though scientifically superseded, established the principle that the body operates as an interconnected system subject to measurable imbalance. The transformation toward modern medicine accelerated in the 19th century. Louis Pasteur and Robert Koch developed germ theory in the 1860s and 1870s, identifying microorganisms as disease agents and enabling targeted interventions. Florence Nightingale, working during the Crimean War in the 1850s, introduced statistical analysis to nursing practice, demonstrating through data visualization that sanitation reduced mortality. Her work is foundational to evidence-based health measurement. The discovery of vitamins in the early 20th century, beginning with Casimir Funk's coinage of the term in 1912 and culminating in the isolation of vitamins A through K, created the field of nutritional science and gave rise to dietary reference intake frameworks. The World Health Organization, founded in 1948, subsequently established global standards for health metrics, disease classification through the International Classification of Diseases, and recommended daily allowances. The BMI as a clinical screening tool gained traction in the 1970s through Ancel Keys' large-scale epidemiological work, which validated Quetelet's index as a population-level obesity indicator. Through the 1980s and 1990s, the Framingham Heart Study produced landmark data linking cholesterol, blood pressure, and lifestyle factors to cardiovascular disease risk, directly shaping the numeric thresholds still used in health calculators. The evidence-based medicine movement, formalized by Gordon Guyatt and colleagues at McMaster University in the early 1990s, demanded that all health recommendations derive from systematically graded clinical evidence. The digital health era beginning in the 2000s brought these formulas to consumer devices, wearable sensors, and smartphone applications, expanding access to health self-monitoring on a global scale and enabling population-level data collection that continues to refine clinical reference ranges.
Frequently Asked Questions
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)\nRight PTA = (20 + 25 + 30) / 3 = 25.0 dB (Slight loss)\nBetter ear PTA = 25.0 dB\n\nMonaural Impairment Left: (30 - 25) x 1.5 = 7.5%\nMonaural Impairment Right: (25 - 25) x 1.5 = 0.0%\nBinaural: (5 x 0.0 + 7.5) / 6 = 1.25%\n\nHigh-frequency slope Left: 45 - 25 = 20 dB (significant)\nHigh-frequency slope Right: 40 - 20 = 20 dB (significant)\nAge-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)\nRight PTA = (20 + 20 + 25) / 3 = 21.7 dB (Slight loss)\nAsymmetry = |50.0 - 21.7| = 28.3 dB (SIGNIFICANT - medical evaluation needed)\n\nMonaural Left: (50 - 25) x 1.5 = 37.5%\nMonaural Right: (21.7 - 25) x 1.5 = 0%\nBinaural: (5 x 0 + 37.5) / 6 = 6.25%\n\nSpeech Recognition estimate: Left ~70%, Right ~95%\nRecommendation: 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 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.
References
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy