Online Decibel Meter

Measure ambient noise levels in your browser using your microphone — free, private, and instant.

Try it Free →

Features

🔊

Real-Time dB Reading

Large live decibel value driven by your microphone, updated smoothly via the Web Audio API.

🎯

Arc Gauge & Pointer

A color-coded gauge (green to red) and level bar make loudness easy to read at a glance.

📊

Current, Average & Peak

Track the current level plus running average and maximum, with one-tap reset.

🗣️

Noise Level Guide

Plain-language labels like Quiet, Conversation, Noisy or Harmful help you interpret the numbers.

🎚️

Calibration Offset

Fine-tune the reading with a ±dB slider if you know the real ambient level.

🔒

100% Private

All audio is processed locally in your browser. Nothing is ever uploaded or stored.

How to Use

1

Tap Start Measuring

Allow microphone access when your browser prompts you.

2

Read the Live Level

Watch the dB value and gauge respond to the sound around you in real time.

3

Check the Stats

Review current, average and peak values, and reset stats whenever you like.

4

Calibrate if Needed

Drag the calibration slider to adjust readings against a known reference.

Frequently Asked Questions

Is this decibel meter accurate?
It gives a rough estimate only. Phone and computer microphones are not professionally calibrated, so readings should not be used for precise measurement or legal, medical, or professional purposes.
Is it free to use?
Yes, the decibel meter is completely free with no sign-up, no ads in your way, and no usage limits.
Is my audio uploaded anywhere?
No. All audio analysis runs entirely in your browser using the Web Audio API. No audio or data is sent to any server.
Why does it need microphone permission?
The tool reads live sound from your microphone to calculate loudness. Access is requested only when you tap Start and the audio never leaves your device.
Why does nothing happen when I click Start?
Microphone access requires a secure HTTPS connection and your permission. Make sure you allowed access and aren't blocking the microphone in your browser settings.

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