How to Check Your Hearing Online (and When to See a Doctor)
What an online pure-tone hearing screening can and cannot tell you: uncalibrated audio limits, safe listening levels, and when to see an audiologist.
Safety First: This online hearing check is an educational screening aid, not a clinical medical evaluation. Never increase headphone volume to hazardous levels to test high frequencies. If you experience sudden hearing loss, ear pain, or dizziness, consult an audiologist or physician immediately.
Gradual hearing loss often goes unnoticed for years because the brain compensates by reading lips, increasing television volumes, and straining to piece together conversation.
An online hearing test provides an accessible way to run an initial screening at home, provided you understand what a browser-based screening can tell you, what it cannot, and when symptoms warrant professional assessment. This guide covers the practical procedure; the companion guide on normal human hearing range covers the statistics behind it.
1. How an Online Hearing Screening Works
Clinical pure-tone audiometry evaluates the quietest sounds you can hear across the standard octave bands: 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, and 8 kHz. Those bands carry most of speech, from the low fundamentals of a male voice up to the fricative energy of s, f and th.
Our browser-native Hearing Test (Audiogram) uses warble sine tones with click-free envelopes, presented separately to each ear. A warble tone wobbles gently around the labelled frequency at 5 Hz, which reduces standing-wave effects from room modes and headphone placement. Each presentation lasts 1.5 s, with a 30 ms attack and an 80 ms release.
The threshold search is a modified staircase:
- Each frequency starts at −30 dBFS, the digital level relative to full scale.
- Answer that you heard it and the next presentation drops 10 dB.
- Answer that you missed it and the next rises 5 dB.
- After four presentations, the quietest level you marked heard locks in as that frequency’s screening threshold.
Seven frequencies per ear at four presentations each is about 42 seconds of tone time, so most of a session is thinking time. Results plot on an SVG audiogram with circles for the left ear and crosses for the right. The up-5, down-10 pattern follows the logic of the modified Hughson-Westlake procedure used clinically, and ISO 8253-1 defines how real screening is performed: air conduction only, one ear at a time, with masking applied to the non-test ear under defined conditions.
| Dimension | Browser screening | Clinical pure-tone audiometry |
|---|---|---|
| Who administers it | You, unsupervised | Audiologist or trained technician |
| Calibration | Unknown; any headphones | Audiometer and earphones calibrated as a system |
| Level scale | dBFS, relative to digital full scale | dB HL, referenced to normal-hearing thresholds |
2. What Online Tests CANNOT Tell You: The Calibration Limit
The hard physical boundary of any web browser test is that your computer and headphones are uncalibrated.
In a clinic, tests happen in a sound-dampened booth, transducers are calibrated as a system, thresholds are reported in dB HL (decibels hearing level) referenced to healthy young adults, and bone conduction testing can bypass the outer and middle ear.
On a computer or phone, output level depends on the volume slider, the digital-to-analog converter, headphone sensitivity (dB/mW) and room noise, and every measurement is relative to digital full scale (dBFS) rather than absolute sound pressure level (dB SPL). Two headphone models can differ by 10 dB or more at the same setting, and a poor ear pad seal can remove 10 to 18 dB of low-frequency output before the tone reaches your ear; the guide to headphones for hearing tests covers seal and driver matching.
Therefore an online test cannot diagnose hearing loss, cannot determine medical causes, and cannot prescribe hearing aids. It also cannot mask the opposite ear properly, so a loud presentation could in principle be heard by the untested ear.
3. What an Online Screening CAN Tell You
Despite the lack of absolute calibration, a controlled home screening provides useful relative information.
- Left versus right ear symmetry. Because the two channels output at identical electrical voltage, an online test detects asymmetry well. If one ear needs a 20 dB louder presentation than the other, that is worth following up, though a blocked ear canal or a mismatched headphone driver produces the same pattern.
- Frequency curve shape. The test shows whether your curve is flat or drops steeply at the top. A dip near 4 kHz is the classic signature of noise exposure, but only a clinician can interpret what it means in your case.
- Personal longitudinal tracking. Repeating the test once or twice a year with the same room, headphones, device and volume setting shows whether your relative thresholds are stable. Log the volume setting, because a changed slider invalidates the comparison.
4. Preparation Checklist for an Accurate Check
- Wear wired over-ear stereo headphones. Never use laptop speakers or room monitors. Bluetooth adds a codec that can filter the top octave and a 120 to 280 ms delay, and true wireless earbuds add a fit variable that a cable removes.
- Find a silent room. Close doors and windows and turn off fans, air conditioners and televisions. A 40 dB SPL noise floor masks quiet tones and inflates low-frequency thresholds most of all.
- Calibrate comfortably first. Play the calibration tone and set a modest, comfortable conversational level. Never touch the hardware volume control once the test begins, because every later threshold is expressed relative to that setting.
- Complete one ear before switching. Hearing commonly differs between ears, and a mixed test hides it.
- Do not chase an inaudible tone with the volume. If you cannot hear an 8 kHz or 10 kHz tone, leave the slider alone; raising it exposes your ears to a presentation far above threshold.
5. When to See a Qualified Audiologist (Red Flag Symptoms)
Online tests are for personal curiosity and screening. If you experience any of the following, arrange an assessment with an audiologist or an ENT physician rather than repeating a home test:
- Sudden hearing loss. If hearing drops abruptly in one or both ears over a few hours or days, treat it as a medical matter to be assessed urgently rather than something to watch at home.
- Asymmetrical hearing. One ear noticeably worse than the other, especially if the difference appeared recently.
- One-sided tinnitus. Ringing, buzzing or hissing perceived in only one ear.
- Physical ear symptoms. Ear pain, fluid discharge, persistent fullness or pressure, or balance problems and vertigo.
6. Common Mistakes That Ruin a Home Screening
These are the mistakes that most often turn a screening into noise.
- Testing in a noisy room and blaming the result. Room noise affects the low bands first, so a “bad” 250 Hz result in a kitchen is usually traffic and a fridge rather than an ear.
- Changing the volume mid-session. It silently rescales every remaining threshold, and the resulting curve is meaningless.
- Using different headphones or a device than last time. New earphones change the dBFS-to-SPL conversion and can move every point on the chart.
To run a private, client-side screening with no audio tracking or data uploads, launch the Hearing Test (Audiogram). For a quicker pass over the band, the Frequency Check walks stepped tones from 20 Hz to 20 kHz and saves which steps you heard.