Hearing Aid Gain Calculator

Prescriptive formulas like NAL-NL2 apply different gain multipliers at different frequencies because low-frequency amplification needs to stay more conservative to avoid overwhelming residual hearing and causing discomfort or feedback, while frequencies in the 1-4 kHz range — where speech consonants that carry most of spoken-word intelligibility live — typically need and tolerate proportionally more gain for the same measured hearing loss.

Age-based adjustments reflect typical clinical patterns rather than the audiogram itself changing — children generally receive slightly more gain because developing auditory and language systems benefit from richer speech audibility, while older adults often receive slightly less gain reflecting typical patterns in loudness tolerance and comfort at that stage of life, independent of what the raw hearing thresholds show.

No — this is a simplified, streamlined approximation of the frequency-specific logic behind prescriptive formulas like NAL-NL2 and DSL v5, not the full clinical algorithm an audiologist actually uses, which also incorporates compression behavior, binaural balance, and other refinements this calculator doesn't model. Treat the output strictly as a starting-point estimate to be verified and adjusted with real-ear measurement during an actual professional fitting.

DSL v5 was specifically developed with pediatric hearing needs in mind, prioritizing full audibility of speech sounds to support language development during a critical developmental window, while NAL-NL2 is generally considered better suited to adult listeners who can report their own comfort and loudness preferences. This calculator reflects that clinical convention by automatically switching prescription methods based on whether the entered age is under 18.