Hearing Loss Assessment Calculator
Pure Tone Average (PTA)
Calculate hearing loss severity from audiogram values
dB HL
dB HL
dB HL
dB HL
Binaural Hearing Loss Percentage
Calculate hearing impairment percentage for both ears (AMA method)
dB HL
dB HL
Formula
PTA (3-freq) = (500Hz + 1000Hz + 2000Hz) / 3 | PTA (4-freq) = (500Hz + 1000Hz + 2000Hz + 4000Hz) / 4 | Monaural impairment (AMA) = (PTA - 25) x 1.5% | Binaural = (5 x better ear + worse ear) / 6
Frequently Asked Questions
What is a Pure Tone Average (PTA)?
PTA is the average hearing threshold across key speech frequencies (typically 500, 1000, and 2000 Hz). It provides a single number representing overall hearing ability and is used to classify hearing loss severity.
What are the degrees of hearing loss?
According to WHO: Normal (0-15 dB), Slight (16-25 dB), Mild (26-40 dB), Moderate (41-55 dB), Moderately Severe (56-70 dB), Severe (71-90 dB), Profound (91+ dB). These are based on PTA.
What causes hearing loss?
Common causes include aging (presbycusis), noise exposure, genetics, ear infections, medications (ototoxic drugs), head trauma, and diseases. Noise-induced hearing loss typically shows a 'notch' at 4000 Hz on the audiogram.
When should I get a hearing test?
Adults should have a baseline hearing test and then regular screenings. See an audiologist if you notice difficulty hearing conversations, frequently ask people to repeat themselves, turn up the TV volume excessively, or experience ringing in the ears (tinnitus).
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