Does this meter transfer my microphone data to a server?

No. All audio processing happens entirely within your browser using the Web Audio API. No audio data, recordings, or measurements are ever sent to any external server. Your privacy is fully protected.

What can a microphone level meter measure?

A microphone level meter measures the sound pressure level (SPL) captured by your device's microphone, expressed in decibels (dB). It can detect ambient noise, conversation levels, traffic, machinery, and more. This tool simulates SPL readings based on your microphone's raw dBFS input level and your chosen calibration settings.

Is this online sound meter accurate?

Consumer device microphones vary significantly in frequency response and sensitivity, so readings are approximate rather than laboratory-grade. For greater accuracy, apply the calibration offset by comparing your reading to a certified reference SPL meter. Use it as a reliable reference tool rather than a replacement for professional equipment.

What is a safe noise level for prolonged exposure?

According to OSHA and WHO guidelines, 85 dB (A-weighted) is the threshold for potential hearing damage with 8 hours of daily exposure. For every 3 dB increase above 85 dB, the safe exposure time is roughly halved — so 88 dB is safe for only about 4 hours, and 94 dB for just 1 hour.

What is the difference between dBZ, dBA, and dBC weighting?

These are frequency-weighting curves applied to SPL measurements. dBZ (Z-weighted) is flat and unweighted, capturing all frequencies equally. dBA (A-weighted) mimics human hearing sensitivity and is used for occupational health and environmental noise assessments. dBC (C-weighted) gives more weight to low frequencies and is used for peak noise and low-frequency measurements.

What do Fast, Slow, and Impulse time weightings mean?

Time weighting controls how quickly the meter responds to changing sound levels. Fast (125 ms) responds quickly and suits most general measurements. Slow (1 s) averages over a longer period, smoothing out brief peaks. Impulse (35 ms) captures very short, sharp sounds like impacts or gunshots.

Can I use this sound meter on a mobile device?

Yes. The meter works in modern mobile browsers (Chrome, Safari, Firefox) that support the Web Audio API. You will need to grant microphone access when prompted. Keep in mind that mobile microphones may have different sensitivity characteristics than desktop or external microphones.

How does noise exposure damage hearing?

Prolonged or repeated exposure to sounds above 85 dB can permanently damage the hair cells in your inner ear, leading to noise-induced hearing loss (NIHL). Because this damage is cumulative and painless at first, monitoring your sound environment regularly is important for long-term hearing health.

Microphone Level Meter

Setting your microphone gain by ear alone is guesswork, so the Microphone Level Meter gives you two real numbers instead: click Start Microphone, speak normally, and watch your Peak and Average (RMS) readings move against a Recommended Band of −18 to −6 dB. A running Clipping Events counter tells you the moment you're too loud, and the Disable browser audio processing toggle turns off auto gain, echo cancellation, and noise suppression so you see your raw input. Use it before a stream or recording session to dial in a level that's neither too quiet nor clipping. Use the microphone record and playback test to check your hardware is actually working the way you expect, right from this page.

Level Meter

Speak normally and watch both meters — aim to stay inside the shaded band

Peak— dB

−60 dB−40 dB−20 dB0 dB

Average (RMS)— dB

−60 dB−40 dB−20 dB0 dB

Disable browser audio processing (auto gain, echo cancellation, noise suppression)

Level Report

Reported once the microphone is live

—Peak

—Average (RMS)

0Clipping Events

−18 to −6 dBRecommended Band

Status & Why Levels "Correct Themselves"

What to do if the microphone won't start, plus why your gain changes might seem to do nothing

Click Start Microphone and allow access when your browser asks.

Auto gain control actively fights manual gain adjustments on your mixer or OS input slider — turn off Disable browser audio processing above if your levels seem to "correct themselves" no matter what you change.

Your environment is louder than you think — and the Microphone Level Meter above gives you real-time dB readings that reveal exactly how much sound is reaching your ears right now. Whether you're checking bedroom sound monitoring before sleep, assessing whether your home office qualifies as a quiet office, or tracking speaker output during mixing, knowing your actual sound level transforms a vague worry into an actionable number. This free online sound meter runs entirely in your browser, using your device's built-in mic to capture and display live data without uploading a single byte to any server.

Live Online Sound Meter Dashboard: Reading Your Real-Time dB Display

How to Read Your Live Sound Level Readings

The meter dashboard updates in real time, typically refreshing several times per second depending on your chosen display update rate. You'll see three core statistics updating continuously: Use the mic echo test to check your hardware is actually working the way you expect, right from this page.

Current level — the instantaneous volume of the audio captured at this moment, expressed in dB, reflecting true perceived loudness at that instant.
Average (Avg) — a running mean that smooths out transient spikes, giving you a stable picture of the ambient environment. This is the figure most relevant to safe exposure and noise regulation decisions.
Max / Peak level — the highest single reading recorded since you started the session. A peak hold display keeps this figure visible so you can spot brief spikes — a slammed door, a cough, a passing motorcycle — that a short session might otherwise mask.

The min avg max summary at the bottom of the session builds your session data over time. For accurate environmental analysis, measure for at least 30–60 seconds to smooth out sudden, transient events before drawing conclusions. Aim for a consistent spacing between your device and the target sound source — even a small change in mic distance can shift dB readings noticeably.

Understanding the Readings: dBFS vs. dB SPL

This is the single most important calibration concept for any browser-based audio meter. The tool measures dBFS — decibels relative to full scale — which is a digital input level, not an absolute sound pressure level (SPL). Here is what that distinction means in practice:

dBFS (Decibels Relative to Full Scale) — the digital level captured by your mic, where 0 dBFS represents the maximum possible digital value before clipping. Values are typically negative (e.g., −30 dBFS, −18 dBFS). A clipping indicator warns you when the input approaches 0 dBFS.
dB SPL (Sound Pressure Level) — the physical measure of sound pressure in air, referenced to the threshold of human hearing (20 µPa). This is what a calibrated Class 1 or Class 2 sound level meter (SLM) measures. Converting between dBFS and absolute dB SPL requires an external calibration step using a known reference source such as an acoustic calibrator.

In practical terms: the relative readings shown by this tool are highly useful for trending, comparing before-and-after scenarios, and general level awareness — but they are not a substitute for an acoustic reading performed with certified equipment for regulatory adherence. Use the optional calibration offset to align the tool's output with a reference SPL meter placed at the same position if you want a rough estimate of absolute dB SPL.

✅ Meter Status and Microphone Access

✅ Status: The status indicator shows whether your browser mic is active and audio capture is running. A green indicator means the meter is reading normally; an orange indicator may signal a permissions issue or device conflict; a red indicator typically means the mic has been blocked at the browser or OS level. If the status shows an error, check your browser permission settings, close other applications using the mic, and refresh the page. Once active, the tool logs a session timestamp so that your exported data log can be matched to a specific date and time.

Note: All audio monitoring happens via local processing within your browser. No audio upload occurs at any point — see the privacy section below for full details.

How to Use This Sound Level Meter Accurately

Step 1: Allow Microphone Access in Your Browser

Step 1: When you click Start Measuring, your browser will display a mic permission prompt. You must grant microphone access for the browser's audio API to begin capturing sound. On desktop, this typically appears as a small dialogue near the address bar. On mobile, iOS Safari and Chrome Mobile will show a system-level popup. Once granted, the ✅ Status: indicator will turn green and the tool will begin displaying live dB readings immediately. Use the microphone quality spectrum analyzer to check your hardware is actually working the way you expect, right from this page.

If the prompt does not appear, check that your browser has JavaScript enabled and that no browser extension is blocking input permissions. On iOS, microphone access is managed via Settings → Privacy → Microphone. On Android, check the Chrome browser site settings for this page. Some corporate network environments or strict browser security policies may also block mic access at the OS level.

Step 2: Position Your Device for Accurate Readings

Step 2: Proper mic placement dramatically affects result quality. Follow these guidelines for more repeatable sound readings:

Maintain a consistent spacing from the sound source — 1 metre is a common standard for home assessments. Write the distance down so future sessions are comparable.
Do not cover or obstruct the built-in mic — even a finger partially blocking the opening will significantly reduce readings.
Ensure stable orientation. The angle from source matters: a laptop mic pointed directly at a sound source will read differently from one positioned at 90°.
Avoid wind interference from fans or HVAC vents close to the mic — these create misleading transient spikes.
Minimise room reflections by measuring in the most acoustically neutral position available. Hard parallel walls create standing waves that can inflate readings.

Step 3: Reading and Logging Your Results

Step 3: Once you've measured for at least 30–60 seconds, review the session data (min, avg, max). Use the average level for exposure and wellness comparisons, and the peak value for identifying sudden events. Click Save Report to generate a local PDF. Use the copy-paste log template in the Saving section below to build a cross-day record for trending and documentation purposes.

Accuracy and Calibration — What to Expect From a Browser Meter

⚠️ Important: No browser-based tool can match the accuracy of a calibrated professional sound meter without external calibration. Here is why, and what you can realistically expect:

Mic sensitivity varies enormously across devices. A smartphone mic, laptop mic, desktop mic, or external USB mic each has a different spectral response and internal gain curve.
Your operating system and browser may apply automatic gain control (AGC), suppression, and echo cancellation to the stream before it reaches the browser's audio engine — which can distort readings. Disabling these system audio enhancements in your OS settings will improve accuracy.
The tool applies a calibration algorithm using a best-fit curve matched to common consumer device mic characteristics, combined with RMS amplitude calculation for input power estimation via an SPL algorithm.
The calibration offset setting allows manual calibration: play a steady 1 kHz tone at a fixed level, hold a reference SPL meter next to your device mic, and adjust the offset until this tool matches the reference. This gives you reference-only alignment that is useful for relative comparisons but does not guarantee accuracy across all spectral bands.
Expect approximately ±3–5 dB variance compared to a calibrated meter with a typical consumer device mic. The readings are best used as a starting point and for relative comparisons rather than exact values.

Is the meter calibrated? The answer is: it uses a software calibration algorithm and allows a manual offset, but it is not independently certified. For legal adherence, always use a Class 1 or Class 2 certified SLM with traceable calibration documentation.

Recommended Hardware for Better Precision

Recommendation: If you need more reliable readings, consider pairing this online tool with a digital sound level meter (standalone unit) such as a NIOSH-compliant SLM or the NIOSH SLM app for iOS. For the most consistent browser-based results, use an external USB measurement mic with a flat spectral response — this bypasses the variable quality of built-in phone or laptop mics and reduces the impact of OS processing on your readings.

A personal noise dosimeter (also called a noise dosemeter) is the appropriate tool for full-shift workplace sound exposure tracking under OSHA or NIOSH guidelines. For a dosimeter to count toward regulatory adherence, it must be certified equipment with a traceable reading documented by an occupational hygienist.

The Free Online Sound Meter Decibel Scale Explained: What Your Numbers Actually Mean

Why Decibels Matter: The Logarithmic Scale

Why Decibels Matter: The decibel scale is logarithmic, not linear. This has a profound practical implication: a 10 dB increase represents approximately ten times more sound intensity, but is only perceived as roughly twice as loud by the human ear. This phenomenon — the gap between physical intensity and perceived volume — is why a loud bar at 90 dB feels only modestly louder than traffic at 80 dB, even though the physical energy difference is enormous. Understanding sound loudness on this scale is essential for making sense of your readings.

The fundamental formula for sound pressure level is:

L_p = 20 \ log₁₀\!left((p)/(p₀)right)

Where L_p is the SPL in dB, p is the measured pressure in Pascals, and p₀ = 20\ muPa is the reference pressure (threshold of human hearing). The dB response of this formula explains why small numeric changes represent large physical differences.

The 3 dB exchange rate — also called the 3 dB rule — is the core principle behind NIOSH safe exposure guidelines. It states that for every 3 dB increase above 85 dB, the maximum safe daily time is halved. This makes every small dB increase far more significant than it looks on a linear scale.

The equivalent continuous sound level (L_eq) — sometimes called Leq — describes the average energy-equivalent level over a period and is the metric used for most workplace and environmental assessments. It accounts for varying levels rather than just a peak or a single snapshot.

Reference Sound Levels from Whisper to Jet Engine

The following table provides reference sound levels for common everyday and occupational sources. These are approximate SPL values under typical conditions. Use them to contextualise the readings from your microphone level meter session.

Sound Level Label (Examples)	Approx. dB SPL	Typical Sound Sources	General Risk
Near silence / threshold	0–20 dB	Anechoic chamber, rustling leaves at distance	No risk
Very quiet room	20–40 dB	Library (30 dB), whisper, quiet bedroom at night	No risk — ideal sleep environment
Quiet / moderate	40–60 dB	Quiet office (40 dB), normal conversation (60 dB), café background	Safe for unlimited daily exposure
Caution zone	60–85 dB	Busy traffic (80 dB), vacuum cleaner, lawn mower (at distance)	Extended exposure may cause fatigue; below 85 dB limit
Harmful / occupational risk	85–100 dB	Power tools (90 dB), motorcycle, hair dryer	8+ hours can cause noise-induced hearing loss (NIHL)
Very harmful	100–120 dB	Chainsaw (110 dB), siren, rock concert, lawn mower (close)	Minutes of exposure risk hearing damage
Dangerous / immediate damage	120+ dB	Jet engine (130 dB), fireworks, gunshot	Immediate hearing damage risk — avoid all exposure

Safe Noise Exposure Limits by Decibel Level

The table below summarises maximum daily exposure time by sound level using the NIOSH guidelines with the 3 dB exchange rate and OSHA Permissible Exposure Limit (PEL) framework. NIOSH uses an 85 dB criterion level with a equal-energy exchange rate; OSHA uses a 90 dB criterion level with a 5 dB exchange rate — less protective of long-term ear wellness.

Sound Level (dB)	NIOSH Max Daily Exposure Time	OSHA PEL (5 dB exchange)	Example Source
70 dB unlimited	Unlimited	Unlimited	Normal conversation, dishwasher
85 dB (85 dB limit)	8 hours	No limit (OSHA action level)	Heavy traffic, loud HVAC
88 dB	4 hours	No limit	Motorcycle (nearby)
91 dB	2 hours	8 hours (OSHA PEL at 90 dB)	Power tools, lawn mower
94 dB	1 hour	4 hours	Loud band practice
100 dB	15 minutes	2 hours	Hair dryer (close), power tools
110 dB	1–2 minutes	30 minutes	Rock concert, chainsaw
120+ dB	Immediate damage	Immediate damage	Jet engine, fireworks, siren

⚠️ Important: These daily exposure figures assume continuous exposure at that level. Real-world sound is intermittent, so the accumulated daily exposure builds across all events throughout the day. Use your average reading (not a brief spike) when comparing against these thresholds. For workplace settings, a personal dosimeter worn throughout the shift gives a far more accurate picture of total cumulative exposure than a spot check.

Frequency Weighting: A-Weighted, C-Weighted, and Z-Weighted

Raw SPL captures all spectral bands equally. But human hearing is not equally sensitive across the full spectrum — we are most sensitive to bands between roughly 2 kHz and 5 kHz, and less sensitive to very low and very high ranges. Frequency weighting filters account for this by adjusting the measured level to better reflect how sound is actually perceived or how it affects specific structures.

Weighting	Symbol	Description	Primary Use Case	Level A-weighted Equivalent
A-weighting	dBA	Mirrors human hearing sensitivity; attenuates low and very high bands. Standard for occupational and environmental noise regulation.	Hearing damage risk, OSHA/NIOSH adherence, environmental standards	85 dBA = NIOSH 8-hr limit
C-weighting	dBC	Near-flat response with modest low-band roll-off. Used for peak SPL (LCpk) readings and low-frequency content assessment.	Peak SPL limits, explosions, LCpk readings, bass-heavy music	Level C-weighted impulse max often 10–15 dB above dBA in bass-rich environments
Z-weighting	dBZ	Completely flat unweighted response across the full spectrum. No correction applied — captures the true physical input.	Scientific work, infrasound research, spectral analysis where no correction is desired	Level Z-weighted impulse maximum often higher than dBA and dBC below 1 kHz

This browser tool applies standard spectral curves via FFT analysis (Fast Fourier Transform) to approximate dBA and dBC weighting of the digital input. The fft analysis uses digital sampling of analog waves, converting them to digital data packets stored as audio files, then applying standard weighting curves to compute the weighted RMS amplitude. Time weighting (fast, slow, and impulse) controls how quickly the tool responds to changing levels — Fast responds in 125 ms, Slow in 1 second, and Impulse is designed to catch transient peaks.

The equivalent value Leq and the short Leq (short-duration equivalent level) are both derived from the same RMS energy-averaging principle and are the basis for daily exposure calculations under NIOSH guidelines and ITU standards. ITU loudness standards — used in broadcasting and mastering — add programme targeting on top of these fundamentals.

What You Can Measure — Practical Applications of Your Sound Meter

Home and Workplace Noise Assessment

What can it measure? The tool is a versatile instrument for a wide range of real-world environments. Common home and workplace applications include:

HVAC assessment: Measure the ambient contribution from your heating and cooling system. HVAC in a home office can push background levels above 50 dB, which — while safe from a hearing-damage standpoint — degrades video conference quality and remote work productivity.
Appliance testing: Check whether a new dishwasher, washing machine, or PC fan matches manufacturer specifications. Many appliances are rated in dBA at 1 metre; hold your device at 1 metre during a cycle for a direct comparison.
Neighbour and construction disturbances: Objectively document levels from a loud neighbour or nearby construction for a dispute or evidence record. Use the Save Report PDF feature to create a timestamped log.
Open-plan office environments: Identify peak periods in open-plan offices and schedule focused work during quieter windows. Ideal productivity levels for concentration tasks are typically 40–50 dB.
OSHA screening: Compare spot readings against the OSHA PEL (90 dBA TWA) and NIOSH REL (85 dBA TWA) to determine whether escalation to certified equipment and a formal assessment is warranted. This tool serves as a screening first step, not a formal compliance reading.

Audio and Entertainment Level Monitoring

For sound engineering, music production, and entertainment-level tracking, the tool provides immediate feedback on room volume and input levels. Use cases include:

Speaker calibration: Set reference levels in your home studio. Many engineers target 78–85 dB SPL (C-weighted) at the mix position for critical listening. Use the tool to calibrate your listening level before a mixing or mastering session.
Checking output levels: Target volume for streaming platforms typically sits around −14 LUFS integrated. While this tool does not directly measure LUFS, confirming that your monitoring environment sits at a consistent reference level helps ensure your gain staging decisions translate correctly across playback systems.
Event and concert tracking: Verify that live output at a venue stays below 100–105 dBA to protect audience ear wellness. A professional sound meter with certified hardware is required for formal work, but a browser-based decibel tool gives a useful real-time indication.
Gaming setup and PC fan assessment: Measure background from your gaming rig under load to quantify the impact on streaming recordings and video calls.

Sleep Environment and Ambient Noise Checks

The WHO recommends indoor levels below 30 dB for undisturbed sleep. Research indicates that nighttime sound above 40 dB begins disrupting sleep architecture even without full awakening — elevating stress hormones, fragmenting restorative stages, and increasing long-term cardiovascular risk. This stress reduction benefit of quieter bedrooms is well-documented in sleep medicine literature. Use the tool to check your sleep environment:

Measure bedroom levels with the window open and closed to quantify the contribution of street and traffic sound.
Check that a white noise machine sits below 50 dB — loud enough to mask transient events without itself contributing to cumulative exposure.
Track nursery levels to ensure your baby's sleep environment stays within WHO-recommended limits, supporting healthy child development and safety.

What Sets a Browser-Based Meter Apart

Unlike a mobile app that requires installation, account creation, or cloud data transfer, this online tool is entirely browser-based. Key differentiators:

No audio upload: All sound monitoring uses local, on-device processing — the stream never leaves your device.
No server data transfer: The Save Report feature uses on-device generation to create the PDF from session data stored only in your browser session.
Free tool, no registration: The core meter is Free to use without creating an account.
Works on multiple devices: Compatible with desktop (Chrome, Edge, Firefox, Safari) and mobile browsers (iOS Safari, Chrome Mobile) — a true desktop and mobile solution in one.
Not a replacement for a calibrated professional sound meter or Class 1/Class 2 SLM for formal legal documentation or regulatory adherence purposes.

Noise and Hearing Health: Why Sound Levels Matter More Than a Number

How Noise Damages Hearing Over Time

How Noise Damages Hearing: The mechanism of noise-induced hearing loss (NIHL) begins inside the cochlea — the fluid-filled spiral structure of the inner ear. When sound enters the ear, it creates waves in the cochlear fluid that vibrate inner ear hair cells. These cells are responsible for translating mechanical vibration into electrical impulses carried by the auditory nerve to the brain.

At sustained high levels — particularly above the 85 dB limit — hair cell damage occurs. The cells become over-stimulated, their tiny stereocilia (the hair-like projections) bend and eventually break. Unlike most cells in the body, cochlear hair cells do not regenerate. Once destroyed, the hearing loss is permanent. Repeated exposures accelerate cumulative damage even when individual sessions feel tolerable.

The first symptoms of NIHL are often subtle: a temporary threshold shift (sounds seem muffled after loud exposure), tinnitus (a persistent ringing in ears), and difficulty understanding speech in noisy environments. Tinnitus management and ear care become lifelong considerations once cochlear damage has accumulated. If you notice these symptoms, a professional hearing test with an audiologist or online audiometer (home hearing test) is an important next step. Hyperacusis — extreme sensitivity, also called auditory hypersensitivity — can also develop following significant exposure, sometimes alongside pulsatile tinnitus or ear clicking symptoms.

NIHL is entirely preventable with adequate hearing protection: use earplugs or earmuffs in any environment sustaining above 85 dBA, and follow the safe listening practice of giving your ears a rest period after prolonged exposure. Consult audiology resources from NIDCD (National Institute on Deafness and Other Communication Disorders) for authoritative guidance.

Sleep Disruption from Nighttime Noise Exposure

Acoustic research from WHO Europe and sleep medicine confirms that elevated sound at night is a distinct public health risk separate from daytime hearing damage. Even at levels well below the damage threshold, chronic sound during sleep:

Elevates stress hormones (cortisol and adrenaline) throughout the night, impairing recovery and undermining stress reduction.
Disrupts REM and deep sleep stages, reducing sleep quality even without full waking.
Contributes to cardiovascular risks including hypertension associations and increased heart disease risk.
Produces cognitive impact: concentration impairment, memory consolidation problems, and — particularly for children — effects on learning and behaviour.
Exacerbates sensitivity over time through a sensitisation effect.

The WHO recommends keeping indoor nighttime levels below 30 dB (L_night) for undisturbed sleep, with an interim target of 40 dB for environments where 30 dB is not yet achievable. The 40 dB threshold is therefore the practical action level for most urban bedroom environments. Use your tool's average reading — not a brief peak — against this benchmark.

WHO and NIOSH Recommended Exposure Guidelines

🏥 WHO Context: The World Health Organization's guidelines identify environmental disturbance as a significant public health concern across all age groups. Key thresholds include:

Workplace sound limits: WHO and NIOSH converge on 85 dBA as the 8-hour TWA limit. NIOSH applies the equal-energy exchange rule (85 dB = 8 hours, 88 dB = 4 hours, 91 dB = 2 hours). OSHA's PEL is 90 dBA TWA with a 5 dB exchange rate — less protective of ear wellness.
Environmental limits: WHO Europe recommends L_den ≤ 53 dB for road traffic and L_night ≤ 45 dB outdoors. For indoor sleep environments, the 30 dB indoor nighttime recommendation applies. Sound monitoring in residential areas helps verify these limits are met.
Safe level for general public: A safe level for unlimited daily exposure is generally considered to be at or below 70 dB — levels at which exposure does not accumulate hearing damage risk over a lifetime.
Exposure limit for children: WHO findings indicate children are more vulnerable to effects on cognitive wellness and school performance; classroom standards typically aim for below 35 dB ambient, making noise regulation in schools a key concern.

For workplace settings, the 8-hour TWA comparison should use an average reading over the full shift — not a single spot check. For proper occupational noise documentation, a NIOSH SLM or a calibrated dosimeter worn throughout the working day is the appropriate approach under formal standardisation frameworks including MIL-STD 1474D and MIL-STD 1474E military specifications. Data collected this way supports formal programs and workplace safety interventions.

Saving and Sharing Your Sound Measurement Report

How to Export and Save a Measurement Log

On-device report generation: Clicking Save Report triggers on-device generation of a PDF summary file directly within your browser. The report captures:

Session timestamp — date and time the reading was taken.
Session data — minimum, average, and maximum dB readings for the full session.
A snapshot of the spectral history chart and the real-time visualiser graph for the session.
Device and browser context — useful for comparing relative readings across sessions on different devices.

Your privacy is our priority. The PDF is generated locally — does this tool transfer data to a server? No. No raw audio, no session data, and no personal information is transmitted. There is no server upload at any stage. The entire processing pipeline — input capture, digital sampling, spectral analysis, RMS amplitude calculation, decibel metering, and report generation — occurs inside your browser using the browser's audio API. This is privacy-first design by architecture, not just policy.

Repeatable guidance: For trending and documentation across multiple days, use a consistent protocol: same time of day, same spacing from source, same device orientation. Note contextual details (window open/closed, HVAC state, weather) alongside each session's readings. The copy-paste log template below supports this structured approach.

Interpreting a Sample Report: A Bedroom Noise Check at Night

This worked example illustrates how to interpret a typical bedroom reading against WHO sleep guidelines.

Scenario: You live near a moderately busy road and want to check whether your bedroom qualifies as a healthy sleep environment. You measure for 60 seconds at 1 metre from the bed, window closed, HVAC off.

Average reading: 34 dB — this is 4 dB above the WHO 30 dB indoor nighttime recommendation, but within the 40 dB interim target.
Max (peak) reading: 48 dB — a brief traffic spike (likely a passing vehicle). The peak from a transient event like this should not be compared to the continuous exposure limit; it indicates a brief disturbance.
Interpretation: The average is in the borderline zone for sleep wellness. The peak indicates occasional events that could trigger micro-arousals during light sleep stages. The environment is acceptable but not ideal.
Recommended actions: Install heavier curtains or acoustic window seals to reduce nighttime ingress from street and traffic sound. Retest with window open to quantify the improvement opportunity. A white noise machine at 45–48 dB could mask transient spikes without exceeding the ambient baseline significantly.

Interpreting a Sample Report: A Workplace Safety Assessment

Scenario: You work in a home workshop with power tools and want to check whether your sound exposure warrants hearing protection. You measure at your typical working position for 90 seconds during active tool use.

Average reading: 84 dB — just below the NIOSH 85 dB action level. However, the tool is browser-based, not a calibrated Class 1 meter. The actual SPL could be 3–5 dB higher, potentially placing you in the 85–90 dB risk zone.
Max reading: 93 dB — during the loudest bursts of tool operation (saw cuts, impacts).
Interpretation against OSHA screening: At 84 dB average, you are at or near the NIOSH REL. Given the calibration caveat (±3–5 dB), treat this as an exposure at the action level. Eight-hour exposure at 87 dB would correspond to only 4 hours safe time under the equal-energy exchange principle.
Recommended actions: Wear earmuffs or earplugs rated to at least NRR 25 during all power tool use. Limit continuous operation sessions and take rest-period breaks. Escalate to a certified Class 2 SLM or a calibrated unit for a formal workplace assessment if exposure continues at this level daily. Occupational safety resources from NIOSH and OSHA provide detailed SOP guidance for formal programs.

Interpreting a Sample Report: A Home Studio Monitoring Check

Scenario: You're setting up a home studio and want to ensure your output levels support accurate mixing decisions without causing hearing damage over long sessions.

Target level: 78–83 dBC (C-weighted, slow time weighting) at the mix position — the standard reference used in professional acoustics for critical listening. This corresponds roughly to volume that feels present and detailed without fatigue during a 4–8 hour session.
Meter reading: 82 dB average at mix position — appropriate for reference use. Any peaks (clipping indicator warnings) should be addressed in the gain staging chain before the input reaches the monitors.
Checking for clipping: The clipping indicator and peak display will warn when the input approaches 0 dBFS. In a studio context, a peak near 0 dBFS indicates either an overly hot gain setting or insufficient headroom in the digital chain.
Recommendation: Use the tool to confirm your level before starting a critical mixing or mastering session. Keep average session level below 85 dB to stay within a safe daily exposure budget. Use the frequency spectrum graph to check for unexpected low-band content buildups caused by room acoustics and reflections — bass buildup in corners is a common source of misleading mixing decisions in untreated rooms. Sound engineering practice recommends supplementing this browser tool with a dedicated loudness plugin for LUFS-based metering during the mixing and mastering stage.

Copy-Paste Log Template for Manual Records

Use this CSV template to build a repeatable cross-session record. Log each session's data immediately after stopping the tool for the most accurate documentation:

date,time,location,distance,device,avg_db,max_db,notes
2026-03-23,21:30,bedroom,1m,phone,34,48,window closed; HVAC off
2026-03-24,21:30,bedroom,1m,phone,36,52,window closed; light rain
2026-03-25,21:30,bedroom,1m,phone,33,46,window closed; quiet night

Columns explained:

date / time — enables trending analysis across days and weeks.
location — identifies the environment (bedroom, workshop, office).
distance — consistent spacing is critical for comparable readings.
device — different devices have different mic characteristics; flagging the device helps interpret level shifts between sessions.
avg_db / max_db — the average is the primary exposure metric; max captures peak events.
notes — contextual detail (window open/closed, traffic, activity) that explains unexpected readings.

More than a number: a structured log transforms isolated readings into actionable trend data. You can track whether sound reduction interventions (new windows, acoustic panels, relocating equipment) are delivering measurable improvements over time. This makes your microphone level meter sessions far more valuable than any single dB reading in isolation.

Frequently Asked Questions About the Microphone Level Meter

Is this sound meter accurate?

This browser-based Sound Meter provides reference-only estimates. Because consumer device mic quality, sensitivity, device gain settings, and OS processing all vary, expect approximately ±3–5 dB variance compared to a calibrated professional sound meter. Is the meter calibrated? It applies a software calibration algorithm and allows a manual offset, but it is not independently certified. For exact readings in legal or formal contexts, use a Class 1 or Class 2 certified SLM with a traceable acoustic calibrator. This tool is suitable for general level awareness, relative comparisons, and initial screening — not regulatory adherence.

Why do I need to allow microphone access?

This sound level meter uses the browser's audio API to access your device's mic stream. Input permissions are required for any reading to occur — without them, the browser cannot capture sound. Granting access does not mean your audio is recorded. All capture is local: the browser processes the input within the page and never transmits raw data to any server. You can revoke permission at any time via your browser settings. On iOS Safari and Chrome Mobile, permission is requested at the OS level and can be managed in your device privacy settings.

Does this meter transfer data to a server?

Does this meter transfer data to a server? No. Your privacy is our priority. All processing is handled locally within your browser. No upload occurs. The Save Report PDF is generated on-device using only the session data (min, avg, max) already displayed on screen. There is no server transfer, no external data transmission, and no recording of your audio. If you have concerns, you can confirm by running the tool while your device is in airplane mode — it will continue to function normally for all features.

Can I use this on mobile devices?

Yes. The tool works on iOS Safari and Android Chrome Mobile (and other modern mobile browsers) once mic access is granted. Note that phone mic quality varies significantly between device models — a flagship smartphone will generally give more consistent results than a budget device. On some Android devices, AGC (automatic gain control) can affect readings; disabling system audio enhancements in OS settings improves consistency. The tool is also fully functional as a desktop option on Mac and Windows in Chrome, Edge, Safari, and Firefox.

Is it free?

Is it free? The core Sound Meter — live dB display, session data, and the record log — is Free with no account required. The Save Report PDF feature and any advanced analysis features may require a pro account depending on the platform version. If reports locked appears when you try to save, check whether your account plan includes report generation. For most everyday sound monitoring and home environment checks, the free tool provides everything you need.

What is a safe noise level?

For ear wellness, a safe level for unlimited daily exposure is generally below 70 dB — at this level, even all-day exposure does not accumulate measurable hearing damage over a lifetime. The NIOSH REL sets the occupational limit at 85 dBA TWA for an 8-hour shift. Above 85 dB, safe time falls rapidly: 88 dB = 4 hours, 91 dB = 2 hours (NIOSH equal-energy rule). For sleep, WHO recommends below 30 dB indoors at night. For general wellness, aim to keep sustained average levels below 70 dB whenever possible, use ear protection above 85 dB, and track your environment regularly with a noise level meter to stay informed.

Is My Workplace Too Loud?

Compare your tool's average reading during a typical work task against the NIOSH REL (85 dBA 8-hour TWA) and the OSHA PEL (90 dBA 8-hour TWA). If your readings consistently sit above 85 dB, the environment likely warrants ear protection and potentially a formal occupational sound assessment with certified equipment. Remember that this browser tool provides a starting estimate with ±3–5 dB uncertainty — if readings are near 82–87 dB, actual levels could be at or above the action level. An employer whose workers are in environments above 85 dBA has legal obligations under OSHA's Hearing Conservation Amendment, including providing a hearing test (audiometric testing), protection, and worker training. Use this tool for initial screening; escalate to certified equipment and a qualified occupational hygienist for formal determinations. Regulatory adherence for workplace sound requires standardisation-certified processes, not browser-based spot checks. Proper audio monitoring with calibrated hardware ensures accurate results for formal documentation purposes.

Frequently Asked Questions

Does this meter transfer my microphone data to a server?: No. All audio processing happens entirely within your browser using the Web Audio API. No audio data, recordings, or measurements are ever sent to any external server. Your privacy is fully protected.
What can a microphone level meter measure?: A microphone level meter measures the sound pressure level (SPL) captured by your device's microphone, expressed in decibels (dB). It can detect ambient noise, conversation levels, traffic, machinery, and more. This tool simulates SPL readings based on your microphone's raw dBFS input level and your chosen calibration settings.
Is this online sound meter accurate?: Consumer device microphones vary significantly in frequency response and sensitivity, so readings are approximate rather than laboratory-grade. For greater accuracy, apply the calibration offset by comparing your reading to a certified reference SPL meter. Use it as a reliable reference tool rather than a replacement for professional equipment.
What is a safe noise level for prolonged exposure?: According to OSHA and WHO guidelines, 85 dB (A-weighted) is the threshold for potential hearing damage with 8 hours of daily exposure. For every 3 dB increase above 85 dB, the safe exposure time is roughly halved — so 88 dB is safe for only about 4 hours, and 94 dB for just 1 hour.
What is the difference between dBZ, dBA, and dBC weighting?: These are frequency-weighting curves applied to SPL measurements. dBZ (Z-weighted) is flat and unweighted, capturing all frequencies equally. dBA (A-weighted) mimics human hearing sensitivity and is used for occupational health and environmental noise assessments. dBC (C-weighted) gives more weight to low frequencies and is used for peak noise and low-frequency measurements.
What do Fast, Slow, and Impulse time weightings mean?: Time weighting controls how quickly the meter responds to changing sound levels. Fast (125 ms) responds quickly and suits most general measurements. Slow (1 s) averages over a longer period, smoothing out brief peaks. Impulse (35 ms) captures very short, sharp sounds like impacts or gunshots.
Can I use this sound meter on a mobile device?: Yes. The meter works in modern mobile browsers (Chrome, Safari, Firefox) that support the Web Audio API. You will need to grant microphone access when prompted. Keep in mind that mobile microphones may have different sensitivity characteristics than desktop or external microphones.
How does noise exposure damage hearing?: Prolonged or repeated exposure to sounds above 85 dB can permanently damage the hair cells in your inner ear, leading to noise-induced hearing loss (NIHL). Because this damage is cumulative and painless at first, monitoring your sound environment regularly is important for long-term hearing health.