Audiology calculator
Fowler-Sabin calculator — binaural hearing loss
Enter the hearing thresholds from your audiogram for the left and right ear. Using the Fowler-Sabin method, the calculator estimates the percentage of hearing impairment for each ear and the binaural (overall) loss, together with the degree of impairment according to the World Health Organization classification (WHO 2021). Your inputs stay on your device.
Important: The Fowler-Sabin method is an orientational model for estimating the binaural (overall) percentage of hearing loss from thresholds at 500, 1000, 2000, and 4000 Hz, where each threshold is converted into a percentage using the non-linear Fowler-Sabin table (maximum contribution: 15%, 30%, 40%, and 15%). Binaural loss = (7 × better ear + 1 × worse ear) / 8. The degree of impairment is shown according to the WHO 2021 classification, based on the better ear’s average threshold. The calculator does not replace a clinical audiology report or an ENT specialist’s assessment. The exact degree of impairment, the type of loss (conductive / sensorineural / mixed), and decisions on treatment or hearing amplification are made by a physician after a complete examination.