What Frequencies Can Humans Hear?
The textbook answer is 20 Hz to 20,000 Hz — but that range is a healthy young ceiling, and what it means in practice is more interesting than the numbers. Here's what those frequencies actually correspond to in the sounds around you, how the top end quietly retreats with age, why hearing loss shows up first at 4 kHz, and how to measure your own range in a couple of minutes.
The 20 Hz – 20 kHz range, and what it really means
Human hearing spans roughly 20 Hz to 20,000 Hz (20 kHz). The low end, around 20 Hz, is felt as much as heard — a deep rumble you sense in your chest. The high end, 20 kHz, is a thin whistle at the edge of perception. But "20 to 20k" describes an ideal young, undamaged ear in quiet conditions. Almost nobody past their teens hears a true 20 kHz, and the range you personally have depends on your age, noise exposure, and genetics. Think of it as the outer envelope, not a promise.
Test yourself now: the hearing age test finds your highest audible frequency and shows the age it maps to — the clearest way to see where your own ceiling sits.
The age-related ceiling
The top of your range drops steadily through life — a process called presbycusis. High frequencies go first because the hair cells that detect them, at the base of the cochlea, take the most wear. Rough age-to-ceiling guide (individual results vary widely):
| Age | Typical upper limit | What you lose |
|---|---|---|
| Under 20 | ~19–20 kHz | Can hear the "mosquito"/teen-repellent tones |
| 20s–30s | ~16–17 kHz | The very top "air" and sparkle |
| 40s | ~14–15 kHz | High cymbal shimmer, some sibilance detail |
| 50s | ~12 kHz | Upper harmonics of voices and instruments |
| 60s+ | ~10 kHz or below | Clarity and "crispness" overall |
None of this affects most speech or music fundamentals — which is why age-related loss creeps in unnoticed. The hearing age test lets you find your own ceiling and compare it to these bands.
Frequency bands of real sounds
Frequencies map onto the sounds you know. Roughly:
- 20–250 Hz — bass. Kick drums, bass guitar, the LFE rumble in films, the fundamental of a male voice (~85–180 Hz).
- 250 Hz–2 kHz — the midrange. Where most of a voice and melody lives; the female voice fundamental sits around 165–255 Hz with its energy above that. This band carries intelligibility.
- 2–5 kHz — presence. The consonants and attack that make speech clear; the ear is most sensitive here (see equal-loudness, below).
- 5–8 kHz — sibilance. The "sss" and "shh" of speech, cymbal edges, and detail.
- 8–20 kHz — "air." Sparkle, openness, and the sense of a recording breathing. Losing this makes audio sound closed-in but not unintelligible.
Infrasound and ultrasound
Below and above the audible range, sound still exists — we just don't hear it as pitch. Infrasound (under 20 Hz) is produced by earthquakes, large machinery, and weather; you feel it as pressure or vibration, and it's why a big subwoofer note is more physical than tonal. Ultrasound (above 20 kHz) is used by bats, medical imaging, and pest repellers — many animals hear well into it (a dog to ~45 kHz, a bat past 100 kHz), but human ears simply can't transduce it.
dB vs. Hz — two different things
A frequent confusion worth clearing up: Hz measures pitch (how high or low), while dB measures loudness (how intense). They're independent axes. A 100 Hz tone and a 10,000 Hz tone can be played at the same 60 dB loudness; the Hz decides the note, the dB decides the volume. When people say a hearing test measures "frequencies you can hear," what it really measures is the quietest dB level at which you can still detect each frequency — your threshold at every pitch.
Equal-loudness, in plain language
Your ears aren't equally sensitive across the range. The equal-loudness curves (the Fletcher–Munson effect) show that we hear the 2–5 kHz region — right where speech consonants live — most easily, while bass and the very top end need more energy to seem as loud. Two practical consequences: bass seems to disappear at low volume (which is what a "loudness" button compensates for by boosting the lows), and a soft high-frequency tone in a hearing test can be genuinely inaudible while a midrange tone at the same level is obvious. It's not your speakers — it's the shape of human hearing.
Why hearing loss shows up first at 4 kHz
Noise-induced hearing loss has a signature: a dip centered near 4 kHz, called the noise notch. Loud exposure — concerts, power tools, gunfire, headphones cranked too high — damages the hair cells tuned to around 4 kHz first, for reasons tied to the ear canal's resonance and cochlear mechanics. Because 4 kHz is above the main speech range, you keep understanding words while losing crispness, so the damage accumulates silently for years. A stepped hearing test across the range can reveal a dip at 4 kHz that a casual "can I hear this?" check would miss — an early warning to protect your ears.
How to test your own range
Two quick self-checks, best done in a quiet room with decent headphones (and at a moderate volume — start low and raise it, never blast a tone to "find" the top):
- Find your ceiling with the hearing age test: it climbs in frequency until you stop hearing it, then reports your upper limit and the matching age band.
- Map your whole range with the hearing test, stepping through frequencies to spot dips like the 4 kHz notch or a low-end rolloff.
- Play any exact frequency with the tone generator to A/B two pitches or confirm a speaker actually reproduces a given tone.
These are quick screening tools, not a clinical audiogram — if you find a real notch or asymmetry between ears, that's a reason to see an audiologist, who can measure your thresholds properly and rule out anything treatable.