Decibel Meter Online — Free Sound Level Meter on Your Phone
Check how loud it is right now with your phone or laptop mic. See the current dB, min, average and max, and a live one-minute graph — free, in your browser, no sign-up. The sound is turned into numbers only, never recorded or sent. A rough estimate, not a certified measurement.
Rough estimate · not a certified measurement · every mic is different
Press “Start measuring” and your browser will ask to use the microphone. The sound is turned into numbers only — never recorded or sent.
Typical sound levels (rough guide)
The numbers on this page are not A-weighted. Published sound levels are usually given in dB(A), which is adjusted to how people hear, so you can’t compare them directly. Use this list only to get a feel for the numbers.
- 30 dBWhisper · very quiet room
- 40 dBQuiet neighborhood at night · library
- 50 dBQuiet office
- 60 dBNormal conversation
- 70 dBVacuum cleaner · busy street
- 80 dBInside a subway car · shouting
- 90 dBConstruction site
Commonly quoted rough figures. Real levels vary a lot with distance and surroundings.
Your input never leaves your browser. Everything runs on this page. Nothing is sent to a server or saved.
How to use · FAQ
How accurate is a decibel reading from a phone?
It’s a rough estimate to get a feel for the level. Phone and laptop mics differ in sensitivity, so the same sound can read a few dB apart — or more — on different devices.
Official sound levels are usually measured in dB(A), which is weighted to match human hearing. The numbers on this page are not A-weighted, so you can’t compare them directly with published figures.
Comparing readings taken with the same device in the same spot is still useful — for example, to see whether it’s louder than yesterday.
What do the min, avg and max mean?
Min and Max are the quietest and loudest moments since you started (the first half second is skipped while the mic settles). Avg is an energy average over the whole time, so short loud sounds count more than they would in a simple average.
When you stop, the big number goes blank so an old reading never looks like a live one. Min, avg and max stay on screen as the result of that session.
Why do loud sounds read lower than I expected?
Many browsers process the mic with automatic volume control and noise suppression. This page asks the browser to turn them off, but some browsers can’t. If yours can’t, we tell you while measuring — loud sounds may then read lower than they really are.
Also check that no other app is using the mic, and keep the phone’s mic uncovered.
Is the microphone sound saved anywhere?
No. The mic sound is turned into numbers (dB) right on this page — never recorded, saved or sent to a server. When you press “Stop measuring” or close the page, the mic is released right away.
Your browser asks for permission first, and the page only measures after you allow it.