How accurate is this online dB meter?

It provides approximate readings that depend on your device and environment. Calibrate using known references like conversation (~60 dB).

What does A‑weighting mean?

A‑weighting emphasizes frequencies the ear hears most and de‑emphasizes very low/high frequencies. It is commonly used for general noise and safety assessments.

How long is it safe to be in loud environments?

Using NIOSH guidance: 85 dB ≈ 8 hours, and every +3 dB halves the safe time (88 dB ≈ 4h, 91 dB ≈ 2h, 100 dB ≈ 15 min).

Is my microphone audio stored?

No. Processing runs locally in your browser and is not uploaded.

Free Online dB Meter (A‑Weighted) + Safe Exposure Calculator

-- dB

Avg: -- • Peak: --

Calibration (0 dB) Weighting

Estimated safe exposure: —

Noise class: —

Includes timestamp, calibrated dB, weighting

Disclaimer: Readings are approximate and depend on your device. Use the calibration slider to align with a known level (conversation ≈ 60 dB).

How to Use the dB Meter

Click Start and grant microphone access.
Speak at a normal level or stand in your room.
Adjust Calibration until the reading matches typical values (quiet room ~30 dB, conversation ~60 dB).

Typical Noise Levels

Environment	dB
Quiet room	30 dB
Conversation (1 m)	60 dB
Busy street	75–85 dB
Motorcycle	95 dB
Concert	100–110+ dB

A‑Weighting vs Z‑Weighting

A‑weighting approximates human hearing sensitivity by rolling off low and very high frequencies. Z‑weighting (flat) leaves frequencies unadjusted. For general hearing safety, A‑weighted levels (dBA) are commonly used.

Safe Exposure Time (NIOSH guideline)

Level	Max Daily Exposure
85 dB	8 hours
88 dB	4 hours
91 dB	2 hours
94 dB	1 hour
97 dB	30 minutes
100 dB	15 minutes

FAQ

How accurate is this meter?

This is a browser‑based educational tool. For compliance measurements, use a calibrated SPL meter.

Why do readings jump?

Sound is dynamic. Use the Average (LAeq) number for a steadier indicator of overall level.

Do you record my audio?

No. Audio is processed locally and never uploaded.

Privacy

This site processes audio locally in your browser. No recordings are uploaded or stored.

Terms

By using this site, you agree that measurements are estimates based on your device’s microphone and calibration. Always follow recognized hearing-safety practices and applicable local regulations. For occupational, regulatory, or clinical assessments, consult professional measurement methods. This site is provided for personal and educational use.