Work out hearing loss percentage instantly with clear inputs, formula shown and shareable results.
Applies the AAO-HNS and AMA method: each ear's impairment is 1.5 percent per decibel above a 25 dB low fence, weighted five to one in favour of the better ear.
AMA binaural impairment
Monaural % = (four-frequency average dB - 25) x 1.5, capped at 100; binaural % = (5 x better ear + worse ear) / 6; whole person % = binaural x 0.35
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
500, 1000, 2000 and 3000 Hz in the AAO-HNS and AMA method.
Thresholds up to 25 dB are treated as causing no measurable impairment of everyday speech understanding.