Hearing Aid Gain Calculator

Calculate prescribed hearing aid gain at multiple frequencies using NAL-NL2 prescription method based on audiometric hearing loss.

Inputs

Hearing Loss at 250 Hz (dB HL)

Hearing Loss at 1 kHz (dB HL)

Hearing Loss at 2 kHz (dB HL)

Hearing Loss at 4 kHz (dB HL)

Patient Age (years)

Tab to move between fields

Results

Overall Prescribed Gain

20.6 dB

Gain at 250 Hz7.8 dB

Gain at 1 kHz18.4 dB

Gain at 2 kHz26 dB

Gain at 4 kHz30 dB

Prescription Method1

How to Use This Calculator

Enter the patient's hearing loss thresholds (dB HL) at 250 Hz, 1 kHz, 2 kHz, and 4 kHz from the audiogram.
The calculator applies the NAL-R half-gain rule to estimate target gain at each frequency.
Review the prescribed gain (dB) across frequencies.
Use the output as a starting point for hearing aid fitting — fine-tune with real-ear measurement.
Always program hearing aids under the supervision of a licensed audiologist.

How the result changes with Hearing Loss at 4 kHz (dB HL)

Hearing Loss at 4 kHz (dB HL)	Overall Prescribed Gain
12	14.6 dB
42	18.3 dB
78	22.8 dB
108	26.6 dB

What each input means

Hearing Loss at 250 Hz (dB HL): Hearing threshold at 250 Hz from audiogram.
Hearing Loss at 1 kHz (dB HL): Hearing threshold at 1000 Hz from audiogram.
Hearing Loss at 2 kHz (dB HL): Hearing threshold at 2000 Hz from audiogram.
Hearing Loss at 4 kHz (dB HL): Hearing threshold at 4000 Hz from audiogram.
Patient Age (years): Patient age. Children (<18) use DSL v5 prescription; adults use NAL-NL2.

What each result means

Prescription Method: 1 = NAL-NL2 (adults), 2 = DSL v5 (pediatric).

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Hearing Loss at 250 Hz (dB HL) = 25, Hearing Loss at 1 kHz (dB HL) = 40, Hearing Loss at 2 kHz (dB HL) = 50, Hearing Loss at 4 kHz (dB HL) = 60 = 5 input(s) provided
Calculate Overall Prescribed Gain
Overall Prescribed Gain = max(0
20.6 = 20.6
Calculate Gain at 250 Hz
Gain at 250 Hz = max(0
7.8 = 7.8
Calculate Gain at 1 kHz
Gain at 1 kHz = max(0
18.4 = 18.4

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