TLDR: Normal hearing means being proficient in detecting sounds between 0 and 25 dB throughout the frequencies tested in a clinical hearing test. The human ear can select up frequencies from 20 Hz to 20,000 Hz, but audiologists concentrate on 250 Hz to 8,000 Hz because that’s where speech lives. Standard hearing ranges differ by age; children hear the greatest frequencies, and that upper limit slowly decreases as people get older. If your results sit outside the normal range, the type and degree of loss determines what comes next.
Most people never think about hearing ranges until a test result sits in front of them. Then suddenly the audiogram with its lines and numbers matters quite a bit. What does 25 dB mean? Is that normal? What frequency is speech at? What counts as actually good hearing versus just functional?
At The Hearing Centre in Singapore, our audiologists explain audiogram results to patients every day. The questions people ask are nearly always the same. These are the answers.
Two Things That Define Hearing: Frequency and Volume
(Previously) Before talking about what’s “normal,” it helps to understand the two things a hearing test really measures.
Frequency (measured in Hz)
Frequency is pitch. Low frequency sounds are deep, like thunder or a bass guitar. High frequency sounds are sharp and thin, like a bird chirping or the sibilant “s” in speech. The unit is hertz (Hz). The human ear can theoretically detect sounds from about 20 Hz up to 20,000 Hz though that upper limit drops significantly with age.
For clinical goals, audiologists test hearing at specific frequencies: 250 Hz, 500 Hz, 1,000 Hz, 2,000 Hz, 4,000 Hz, and 8,000 Hz. This scope covers the full span of human speech, which is why it’s used. Most of what people say to each other consonants, vowels, the subtleties that distinguish words from each other falls between 500 Hz and 4,000 Hz.
Volume (measured in dB)
Volume is loudness. Decibels (dB) measure how loud a sound has to be before you can detect it. The lower the number, the softer the sound. A person with excellent hearing can pick up very soft sounds — in the range of 0 to 10 dB. A person with hearing loss needs sounds to be louder before they register.
An audiogram plots both of these — frequency on the horizontal axis, volume on the vertical axis. Each mark on the graph shows the quietest sound you could detect at that frequency during the test.
What Is the Normal Hearing Range?
The normal hearing range in adults is typically defined as 0 to 25 dB across the tested frequencies. This means a person with normal hearing can detect very quiet sounds — a whisper, leaves rustling, a clock ticking — without any problem.
Hearing that falls within 0 to 25 dB is considered clinically normal. There’s no hearing loss. No intervention is needed.
Here’s how different dB levels translate to everyday sounds:
Sound | Approximate dB Level |
Breathing, rustling leaves | 10 dB |
Whisper | 20 dB |
Quiet library | 30 dB |
Normal conversation | 60 dB |
Busy restaurant | 70 dB |
Traffic | 80 dB |
Power tools | 90 dB |
Concerts, live music | 100 to 110 dB |
Fireworks, gunshot | 140 dB |
If your hearing threshold sits at 0 to 25 dB, you can detect everything in that list without difficulty. When the threshold rises above 25 dB, quieter sounds start to disappear.
Hearing Loss Categories
When results fall outside the normal hearing range, they’re classified by degree of loss.
Hearing Level (dB) | Category | What It Means |
0 to 25 dB | Normal | Full hearing range |
26 to 40 dB | Mild | Soft speech and whispers hard to follow |
41 to 55 dB | Moderate | Regular conversation becomes difficult |
56 to 70 dB | Moderately Severe | Need loud speech, group conversations very hard |
71 to 90 dB | Severe | Only very loud sounds are heard |
91 dB and above | Profound | Very little or no usable hearing |
Most people are surprised to learn that mild hearing loss at 30 to 40 dB already affects daily conversation quality. You might follow a quiet one-on-one chat fine, but lose track completely in a restaurant or group setting.
The Speech Banana: Why Certain Frequencies Matter More
In audiology, there’s a concept called the “speech banana” — a banana-shaped region on the audiogram where almost all the sounds of human speech are located. It spans roughly 500 Hz to 4,000 Hz and sits at volume levels from 20 to 60 dB.
Every consonant and vowel in human language falls somewhere in this zone. Vowels tend to be lower frequency and louder. Consonants like “s,” “f,” “th,” and “sh” are high frequency and quieter — they sit at the top right of the speech banana.
This is why high frequency hearing loss is particularly difficult in conversation. The vowels in a word still come through fine — “a,” “e,” “o” — but the consonants that distinguish one word from another disappear. “Ship” and “chip,” “sun” and “fun,” “three” and “free” start sounding identical. The person hears that someone is speaking but struggles to catch what’s being said.
When an audiologist reads an audiogram, the speech banana is one of the first things they check. How much of it falls within your hearing range tells you a lot about how well you can follow everyday conversation.
Normal Hearing Range by Age
The normal hearing range changes across a lifetime. This is important to understand, because a result that’s perfectly normal for a 65-year-old might be unexpected in a 30-year-old.
Newborns and infants
Babies can detect frequencies from around 20 Hz to 20,000 Hz when the auditory system is healthy. They respond to sound from birth — the startle reflex, turning toward voices — and the hearing frequency test done at birth (OAE screening) checks whether the inner ear is functioning correctly from day one.
Children and teenagers
Children typically have the widest hearing range of any age group. They can hear high frequencies up to around 17,000 to 20,000 Hz that most adults can no longer detect. This starts to narrow through teenage years with noise exposure playing a significant role.
Young adults (20 to 40)
Normal hearing range at this age is 20 Hz to around 16,000 Hz in a healthy ear. Audiometric testing focuses on 250 to 8,000 Hz, where this age group should typically show thresholds well within the normal 0 to 25 dB zone.
Middle-aged adults (40 to 60)
Age-related changes in the cochlea become more noticeable. High frequency sensitivity — particularly above 4,000 Hz — often starts to drop. This is the beginning of presbycusis (age-related hearing loss). Results may still fall within the borderline normal range but the high-frequency end often shows early changes.
Older adults (60+)
High frequency hearing loss is almost universal to some degree. The normal hearing range in this group is commonly shifted — many have near-normal low frequency hearing but significant high frequency loss. In Singapore, over 60% of adults aged 60 and above have some degree of hearing loss.
Age Group | Typical Hearing Range | Common Change |
Newborns | 20 Hz to 20,000 Hz | None (if healthy) |
Children | 20 Hz to 20,000 Hz | None (if no noise exposure) |
Young adults | 20 Hz to 16,000 Hz | Slight narrowing at upper end |
Middle age | 250 Hz to 10,000 Hz | High frequency loss begins |
60+ | 250 Hz to 6,000 Hz typically | Significant high frequency reduction |
What Affects Normal Hearing Range
Several things push hearing outside the normal range over time.
Age
The cochlea contains tiny hair cells that convert sound vibration into electrical signals. These cells don’t regenerate. They die gradually over a lifetime, starting at the high-frequency end of the cochlea which handles the highest pitches. This is why high-frequency hearing is the first to go in older adults.
Noise exposure
Loud noise kills cochlear hair cells faster than age alone. A single extremely loud event — a gunshot, an explosion — can cause immediate permanent damage. Repeated exposure to sounds above 85 dB causes cumulative damage over time.
In Singapore, the Ministry of Manpower reported a significant jump in noise-induced deafness cases, rising from 168 in 2021 to 624 in 2022. Noise induced hearing loss is entirely preventable with proper hearing protection but irreversible once the hair cells are gone.
Ear disease and infection
Repeated middle ear infections, perforated eardrums, or otosclerosis can shift hearing outside the normal range. This type is often conductive — the inner ear is fine but something is blocking or disrupting sound transmission through the middle ear.
Genetics
Some people are born with hearing that falls outside the normal range due to genetic factors. Others have a genetic predisposition to earlier age-related loss.
Ototoxic medications
Certain antibiotics (aminoglycosides), chemotherapy drugs, and high-dose aspirin can damage cochlear hair cells as a side effect.
Reading Your Audiogram Results
An audiogram looks complex at first but follows a simple pattern once you know what you’re looking at.
X axis (horizontal): Frequency in Hz, from low pitches (left) to high pitches (right). The range shown is typically 250 Hz to 8,000 Hz.
Y axis (vertical): Volume in dB, from quiet sounds at the top (0 dB) to loud sounds at the bottom (120 dB). This feels backwards — better hearing sits higher on the graph.
Each mark represents the softest sound you could detect at that frequency. Marks clustered near the top of the graph (0 to 25 dB) indicate normal hearing range. Marks lower on the graph indicate that louder sounds were needed before you heard them — hearing loss.
Common audiogram patterns:
Flat audiogram: Similar thresholds across all frequencies. If within the normal range, all frequencies are equally good. If showing loss, all frequencies are similarly affected.
Ski-slope audiogram: Good hearing at low frequencies but significant loss at high frequencies — the line slopes down toward the right side of the graph. This is the most common pattern in age-related and noise-induced hearing loss.
Cookie bite audiogram: Normal hearing at low and high frequencies but loss in the mid-range. Less common. Often related to certain genetic conditions.
Signs Your Hearing May Be Outside the Normal Range
Some hearing changes are obvious. Others are easy to dismiss or attribute to something else. Common signs to watch for:
- Asking people to repeat themselves regularly, not occasionally
- Finding conversations in restaurants or noisy places genuinely exhausting
- TV volume that keeps creeping up
- Hearing people speak but struggling to make out the words clearly
- Missing soft sounds — a phone vibrating in another room, a doorbell from elsewhere in the house
- Ringing or buzzing in one or both ears (tinnitus)
- People regularly commenting that you didn’t hear them
Children show it differently. Delayed speech development, not responding to their name consistently, needing the TV louder than siblings, or teachers reporting difficulty following classroom instructions — these are worth getting assessed.
What to Do If You’re Outside the Normal Hearing Range
The first step is a proper hearing assessment. A hearing test at The Hearing Centre includes pure tone audiometry to map your thresholds at each frequency, speech testing to measure how well you understand words in quiet and noise, and tympanometry to check middle ear function.
Results tell you two things: how much loss you have (degree) and where in the frequency range it sits (type). Both shape what comes next.
For conductive hearing loss — where something is blocking sound in the outer or middle ear — medical treatment is often possible. Earwax removal, antibiotics for infection, or surgery for structural problems.
For sensorineural hearing loss — damage to the inner ear or auditory nerve — hearing aids are the most effective management available. Modern devices from Phonak, Signia, Oticon, ReSound, Starkey, and Widex work specifically on the frequencies where hearing falls below the normal range. They don’t amplify everything equally — they’re programmed to your specific audiogram, boosting the frequencies where your hearing has dropped and leaving the ones that are still within normal range alone.
For patients using hearing aids Singapore through The Hearing Centre, the audiogram from your hearing test is what the device programming is built around. That’s why the test always comes first.
How to Protect Normal Hearing Range
If your hearing currently sits within the normal range, protecting it is significantly easier and more cost-effective than treating loss after it occurs.
Wear ear protection around loud sounds. The damage threshold is 85 dB. Anything at or above this level causes permanent hair cell damage with prolonged exposure. A concert sits at 100 to 110 dB. Two hours without earplugs is enough to cause measurable damage.
Give your ears recovery time after loud noise. Temporary threshold shifts (hearing feels muffled after a concert) signal that the cochlear hair cells are stressed. Persistent exposure without recovery leads to permanent change.
Control earphone volume. In-ear earphones at maximum volume reach around 100 dB — well into the damage zone. Keep volume at 60% or below. If people nearby can hear your earphones, they’re too loud.
Get your hearing checked regularly. Changes in the normal hearing range are gradual and easy to miss. Annual checks after age 50 catch early changes before they become significant.
When to Book a Hearing Test at The Hearing Centre
Come in if you’re noticing any of the signs listed above. Come in if you’ve been regularly exposed to loud noise over years at work or through lifestyle. Come in if you simply haven’t had your hearing checked in several years and want to know where your baseline sits.
The Hearing Centre has clinics across Singapore staffed by MOH-approved audiologists. A full hearing assessment takes around one hour and tells you precisely where your hearing sits relative to the normal hearing range — across all the frequencies that matter for daily life.
Frequently Asked Questions
Normal hearing sits between 0 and 25 dB. This means you can detect very quiet sounds — whispers, rustling leaves — without any difficulty. Results above 25 dB indicate some degree of hearing loss.
A healthy young adult can typically hear from 20 Hz to 20,000 Hz. For clinical hearing tests, audiologists focus on 250 Hz to 8,000 Hz because this covers the entire frequency range of human speech.
Mild hearing loss is classified as 26 to 40 dB. At this level, soft sounds and whispered speech are difficult to hear, and following conversation in background noise becomes an effort.
Yes. High frequency hearing gradually decreases with age. Children can hear up to 20,000 Hz. By middle age, the upper limit typically drops to around 12,000 to 16,000 Hz. In older adults, significant loss above 4,000 Hz is very common.
An audiogram is a chart showing your hearing sensitivity across different frequencies. The horizontal axis shows frequency (pitch) from left to right. The vertical axis shows volume (dB) from quiet at the top to loud at the bottom. Marks sitting near the top of the chart indicate normal hearing range.
Most speech sounds fall between 500 Hz and 4,000 Hz at volumes between 20 and 60 dB. Vowels tend to be lower frequency and louder. Consonants like “s,” “sh,” “f,” and “th” are higher frequency and quieter.
Yes. Prolonged exposure to sounds above 85 dB permanently damages cochlear hair cells. Once gone, they don’t regenerate. This is why noise-induced hearing loss is irreversible. Hearing protection prevents it but nothing restores it after the fact.
Singapore’s newborn hearing screening programme tests babies before they leave hospital. After that, watch for delayed speech development, not responding to their name, or needing TV volume significantly higher than peers. A paediatric hearing test confirms whether results are within the normal range.
The next step depends on the type and degree of loss. Conductive hearing loss often responds to medical treatment. Sensorineural hearing loss is managed with hearing aids programmed specifically to your audiogram. The Hearing Centre carries out the full assessment and advises on the most appropriate next step.
Once a year after age 50. Before 50, every two to three years is reasonable unless you work in a noisy environment, have been exposed to significant noise, or notice any changes. A baseline test at any age is useful — it means future changes can be measured against a known starting point.
