Online Decibel Meter

Online Decibel Meter - Free Sound Level Measurement

Measure sound levels instantly with our free online decibel meter. Works in your browser using your device's microphone.

0.0
dB SPL
Ready

Measurement History

0 records saved

No measurement records yet

Start a measurement to save data

Click "Start Measurement" to begin checking sound levels with your microphone.

You'll need to allow microphone access when your browser asks.

How to Use

Step-by-step guide to measuring sound levels accurately

Decibel Chart

See how loud common sounds are in decibels

Hearing Protection

Learn about safe noise levels and protecting your ears

What You Can Do

Simple tools for everyday noise monitoring

Live Readings

See sound levels update instantly with a visual waveform and color indicators

Track Your Data

View max, min, and average readings from your measurement sessions

Improve Accuracy

Calibrate against a reference meter if you need more precise measurements

Save Results

Download your measurement data as CSV or JSON files

What is a Decibel Meter?

A decibel meter (also called a sound level meter or noise meter) measures how loud sounds are. Our online version uses your device's microphone to measure noise levels in real-time.

0-60 dB
Safe & Quiet
60-85 dB
Moderate
85+ dB
Harmful

How to Use

1

Allow Access

Grant microphone permission when your browser asks

2

Start Measuring

Click the Start button to begin checking sound levels

3

View Results

Watch the live readings and waveform display

4

Export Data

Save your measurements if you need them later

Why Use This Tool?

Free & No Install

Works right in your browser - no apps to download

Your Privacy Matters

All processing happens on your device. We don't record or store any audio.

Good Enough for Most Uses

Calibration support helps improve accuracy for everyday measurements

Works Everywhere

Use on your phone, tablet, or computer with any modern browser

Common Questions

How accurate is this online decibel meter?
It depends on your device's microphone. Most smartphones and laptops give decent readings for everyday use. For professional work (like workplace safety testing), you'll want a certified sound level meter instead.
Do I need to download anything?
Nope! Just open this page in your browser and allow microphone access. That's it.
Is my audio being recorded?
No. Everything happens locally in your browser. We don't record, store, or send any audio data anywhere.
What browsers work with this?
Chrome, Firefox, Safari, and Edge all work fine. Make sure you're using a recent version and allow microphone access.
What's a safe noise level?
Generally, sounds under 70 dB are safe. Prolonged exposure above 85 dB can damage your hearing. Anything over 120 dB can cause immediate harm. Check our hearing protection guide for details.

Important Note

This tool is for general reference and educational purposes. Results depend on your device's microphone quality and may not be as accurate as professional sound level meters. For critical applications (workplace safety, legal documentation, medical purposes), please use certified equipment.