The free Decibel Meter
Free online decibel meter. Measure how loud a place is using your microphone: live dB level, minimum, average and maximum, A-weighting.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Quiet office 42 dB(A) · normal conversation 60 dB(A) · vacuum cleaner 72 dB(A) · club 100+ dB(A).Open the Decibel Meter
Illustration. Open the tool for the real thing.
What is the Decibel Meter?
A decibel meter tells you how loud a place is. This one uses your device's microphone to show a live level in decibels with a colour bar, a scrolling graph, and the minimum, average and maximum over your session, so you can compare rooms, find noisy machines or check whether a neighbour, a classroom or a workplace is above a comfortable level.
Choose flat (Z) or A-weighted readings — dB(A) matches how the human ear responds and is the standard for noise limits — set an alert level and be warned the moment the sound goes over it. Phone and laptop microphones are not calibrated, so absolute numbers are estimates; use the calibration offset to match a reference meter and the readings become reliable for comparisons. Nothing is recorded or uploaded.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Big readout, colour bar and a scrolling level history.
Track a whole session, with a timer.
dB(A) or flat, adjustable to a reference meter.
Set a threshold and get a timestamped warning.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Teachers and event organisers
Keep classrooms and events within a comfortable level.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
How accurate is a phone decibel meter?
Typically within 5–10 dB without calibration, and much better for comparing places. Use the calibration offset to match a proper meter.
What is dB(A)?
A frequency weighting that mimics how loud sounds seem to the human ear. It is used in workplace and environmental noise limits.
What is a safe noise level?
Below about 70 dB(A) is safe for all-day exposure. At 85 dB(A) risk begins after about 8 hours, and every +3 dB halves the safe time.
Why is my reading 0 or very low?
The microphone may be muted or blocked. Check permissions and your system input.
Does it record sound?
No. Levels are calculated live and the audio is discarded.
More free tools
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Try the Decibel Meter now
Measure noise levels with your microphone — with A-weighting, min/max and alerts. Free to use.
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