Hearing Aid Frequency Reference
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Hearing Aid Frequency Reference maps the eight frequency bands that a hearing aid fitting conversation usually revolves around, showing which speech sounds live in each band and how far a tone has to rise above a threshold to be heard. It is a visual and numeric reference rather than an audio processor.
What is Hearing Aid Frequency Reference?
Nothing is uploaded here and nothing is played back, so this is a reference chart and calculator for hearing aid conversations rather than an audio tool. The page draws a logarithmic frequency axis from 125 Hz to 10 kHz and divides it into eight fitting bands centred on 250, 500, 1000, 2000, 3000, 4000, 6000 and 8000 Hz. Each column is shaded by how critical that band typically is for understanding speech, and the band edges sit at the geometric mean between neighbouring centres, so the chart above and the lookup below can never disagree about where one band ends and the next begins.
On top of the static chart the page adds three interactive controls:
- Eight fitting bands centred on 250, 500, 1000, 2000, 3000, 4000, 6000 and 8000 Hz.
- Importance shading from 1, for air and sparkle, up to 5 for the fricative and s-region bands.
- Eight average adult vowel formants, each with F1 for openness, F2 for frontness and an example word.
- A frequency explorer running from 125 Hz to 10,000 Hz in 5 Hz steps.
- A tone level control from 20 to 90 dB SPL and a hearing threshold control from 0 to 90 dB HL.
- A readout that reports how far the tone sits above the threshold you entered.
The lookups are plain arithmetic. A band function compares the chosen frequency against the geometric-mean boundaries and returns that band's speech content and its fitting note, so moving the frequency slider rewrites the explanation underneath it in real time. The sensation level is calculated by subtracting the threshold in dB HL from the presentation level in dB SPL and then clamping the result at zero, which is why the number never goes negative; at or below threshold it simply reads 0 dB and reports that the tone is likely inaudible. The vowel markers are positioned on the same logarithmic axis using the second formant as the horizontal coordinate, with the first formant given as the openness figure in the caption. The values are average adult data published by Peterson and Barney in 1952, not measurements of any individual speaker.
It is worth being explicit about the edges of the tool:
- It is a teaching reference, not a fitting: it cannot read an audiogram, prescribe gain or produce a hearing aid prescription.
- Sensation level floors at 0 dB, so it cannot show how far below threshold a sound actually falls.
- The vowel formants are average adult values and ignore age, accent and vocal tract size.
- The axis stops at 125 Hz and 10 kHz, so sub-bass and the highest air frequencies are off the chart.
- It produces no sound at all; the frequency map is purely visual and numeric.
- Band importance is a general speech-clarity guide, not a clinical target for any one listener.
Use the chart as a translation layer. When a fitting screen shows gain at 3 kHz, the reference tells you that band carries the s, sh and f sounds that mark plurals and verb endings, which is often the difference between hearing a voice and understanding it. When someone describes a problem as muffled but still audible, the shading points at the 2 to 4 kHz region where consonants separate from background noise. Read it alongside a real audiogram and a real audiologist rather than in place of them.
How to use Hearing Aid Frequency Reference
- Read the eight fitting bands chart: each column is labelled with its centre frequency, and the shading plus importance dots show how critical that band usually is for speech.
- Find where a vowel sits using the markers under the chart, each labelled with its F1 and F2 values and an example word such as beet or boot.
- Drag the frequency slider across the 125 Hz to 10,000 Hz range to look up any single value; the panel names the band it falls in and prints that band's speech content and fitting note.
- Set the tone level and your threshold to read the sensation level in dB, then move either slider to see how much headroom the tone has above threshold.
When to use Hearing Aid Frequency Reference vs related tools
Hearing Aid Frequency Reference answers the question of what a frequency means for speech, which makes it a natural companion to the tools that measure real audio. Point Frequency Analyzer at a recording to see where its energy actually sits, then use this chart to interpret those peaks in terms of speech sounds. To measure a single tone rather than a spectrum, Frequency Counter reports the fundamental frequency of what it hears, and Tone Generator lets you produce a clean tone at any band so you can hear the difference between 1 kHz and 4 kHz directly. For the musical equivalent of the same lookup, Note Frequency Calculator converts between note names and hertz.
Privacy & Security
This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.