Online Sound Meter – Measure Decibels (dB)
Check how loud it is around you. This free sound meter uses the microphone of your phone or computer to show the noise level in decibels, live. There is no app to install, and nothing is recorded.
How to use the sound meter
- Press Start and allow the microphone.
- Hold your device still, with the microphone pointing at the sound.
- Read the live level, the average (AVG) and the maximum (MAX). The download button saves a report.
Decibel levels chart
| Level | Example | Safe per day* |
|---|---|---|
| 30 dB | Whisper | No limit |
| 40 dB | Quiet library | No limit |
| 60 dB | Normal conversation | No limit |
| 70 dB | Vacuum cleaner | No limit |
| 85 dB | Heavy traffic | 8 hours |
| 100 dB | Motorcycle | 15 minutes |
| 120 dB | Siren, thunder | Seconds |
*Based on the NIOSH limit of 85 dB(A) for 8 hours. Loud noise can damage your hearing for good, so use hearing protection above 85 dB.
Frequently asked questions
Is my audio recorded?
No. The sound is measured live in your browser. Nothing is recorded, saved or sent anywhere.
How accurate is it?
Every phone and laptop microphone is a little different, so readings can be a few dB off. For better accuracy, use the calibrate button at the top and match the reading to a real sound level meter once. It is not a certified measuring device.
What do AVG and MAX mean?
AVG is the average sound level since you pressed Start. MAX is the loudest level reached. The reset button clears both.
Does it work on iPhone and Android?
Yes. It works in Safari, Chrome, Firefox and Edge on phones and computers. Allow microphone access when asked. If it does not start inside another app, open the page in your normal browser.
Can I install it as an app?
Yes. In Chrome, Edge or Samsung Internet use the Install button or the install icon in the address bar. On iPhone and iPad tap Share, then Add to Home Screen. In Safari on a Mac choose File › Add to Dock. The app opens in its own window and also works offline.
What is dB(A)?
dB(A) measures sound the way human ears hear it, giving less weight to very low and very high tones. Hearing safety limits are given in dB(A).